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Linear equations are not always set up in the form y mx b. Sometimes it is easy to rearrange the equation. Other times you may wish to graph using intercepts.
Graphing Lines
Recall: The Cartesian Plane is a grid used to graph points. It is divided into 4 quadrants as shown (use Roman numerals to represent the quadrants). Note:
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Finding Slope: By Graphing. Finding Slope Given a Graph: * Choose any two points on the line. Step 1: Begin at one of the points and count vertically until
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U4L5 - Graphing Lines Using m and b or intercepts.notebook
Jan 16 2017 You now have a strong understanding of graphing lines by using a table of values and plotting points. You should also be.
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GRAPHING LINEAR EQUATIONS IN TWO VARIABLES To graph equations of this form construct a table of values (Method 1) or use the slope.
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GRAPHING LINEAR EQUATIONS IN TWO VARIABLES
The graphs of linear equations in two variables are straight lines. Linear equations may be written in
several forms:Slope-Intercept Form: y = mx+ b
In an equation of the form y = mx + b, such as y = 2x 3, the slope is m and the y-intercept is thepoint (0, b). To graph equations of this form, construct a table of values (Method 1) or use the slope
and y-intercept (Method 3) (see Examples 1 and 6).
General Form: ax + by = c
To graph equations of this form, such as 3x 2y = 6, find the x- and y-intercepts (Method 2), or solve
the equation for y to write it in the form y = mx + b and construct a table of values (see Example 2).
Horizontal Lines: y = b
The graph of y = b is a horizontal line passing through the point (0, b) on the y-axis. To graph an equation
of this form, such as y = 4, plot the point (0, b) on the y-axis and draw a horizontal line through it (see
Example 4). If the equation is not in the form y = b, solve the equation for y.Vertical Lines: x = a
The graph of
x = a is a vertical line passing through the point (a, 0) on the x-axis. To graph a verticalline, such as 4x + 12 = 0, solve the equation for x to write it in the form x = a, plot the point (a, 0) on the
x-axis, and draw a vertical line through it (see Example 5).METHOD 1: CONSTRUCT A TABLE OF VALUES
To graph equations of the form y = mx and y = mx + b,1) Choose three values for x. Substitute these values in the equation and solve to find the
corresponding y-coordinates.2) Plot the ordered pairs found in step 1.
3) Draw a straight line through the plotted points. If the points do not line up, a mistake has been made.
Example 1: Graph y = 2x 3
To graph the equation, choose three values for x and list them in a table. (Hint: choose values that are
easy to calculate, like 1, 0, and 1.) Substitute each value in the equation and simplify to find the corresponding y-coordinate. Plot the ordered pairs and draw a straight line through the points.XY(- 1, - 1)
(0, -3) (1, - 5)x y = 2x 3 (x, y) 1 y =2(1) - 3
= 2 - 3 = 1 (1, 1) 0 y = 2(0) - 3 = -3 (0, -3) 1 y =2(1) - 3
= 2 - 3 = 5 (1, 5)PBCC Page 1 of 5 SLC Lake Worth Math Lab
Example 2: Graph 3x 2y = 6
The equation 3x
2y = 6 is written in the general form. To graph this equation with a table of values,
first solve the equation for y to write it in the form y = mx + b, as shown:3x 2y 6
3x 2y 3x 3x 6
2y 3x 6
2y 3x 6
223yx32 2 Next, choose three values for x and calculate the corresponding y-coordinates. (Hint: to cancel
fractions, choose multiples of the denominator.) Plot the points in the table and draw a line through
them. x 3yx23 (x, y)
2 3y2 2 3 330(2, 0) 0
03y320 (0, 3)
2 3y2 2 3 336(1, 6) XY (-2, 0)(0, 3)(2, 6)
METHOD 2: FIND THE X- AND Y-INTERCEPTS
In Example 2, the line crosses the x-axis at (2, 0) and y-axis at (0, 3). The point where the linecrosses the x-axis is called the x-intercept. At this point, the y-coordinate is 0. The point were the
line crosses the y-axis is called the y-intercept. At this point, the x-coordinate is 0.When an equation is written in the general form, such as 2x + 4y = 8, it is easier to graph the equation
by finding the intercepts.1) To find the
x-intercept , let y = 0 then substitute 0 for y in the equation and solve for x.2) To find the
y-intercept , let x = 0 then substitute 0 for x in the equation and solve for y.3) Plot the intercepts, label each point, and draw a straight line through these points.
PBCC Page 2 of 5 SLC Lake Worth Math Lab
Example 3: Graph 2x + 4y = 8
1) To graph the equation, find the x- and y-intercepts.
To find the
x-intercept , let y = 0 and solve the equation for x. y0, 2x4y82x 4 8
2x 8 x40The x-intercept is (4, 0).
To find the
y-intercept , let x = 0 and solve the equation for y. x0, 2x4y8 24y4y 8 y20 8
The y-intercept is (0, 2).
2) Next plot each intercept, label the points, and draw a line through them.
XY (- 4, 0)(0, 2)Graphing Horizontal and Vertical Lines
The graph of y = b is a horizontal line passing through the point (0, b), the y-intercept. The graph of
x = a is a vertical line passing through the point (a, 0), the x-intercept.Example 4: Graph y = 4
To graph the equation, plot the intercept on the y-axis, label the point, and draw a horizontal line through the point.
XY (0, 4)PBCC Page 3 of 5 SLC Lake Worth Math Lab
Example 5: Graph 4x + 12 = 0
First, solve the equation for x to write it in the form x = a4x 12 0
12 12 4x 12 x3The x-intercept is (3, 0). Plot this point on the x-axis, label the point, and draw a vertical line through the
point.XY(-3,0)
METHOD 3: USE THE SLOPE AND Y-INTERCEPT
To graph an equation using the slope and y-intercept,1) Write the equation in the form y = mx + b to find the slope m and the y-intercept (0, b).
2) Next, plot the y-intercept.
3) From the y-intercept, move up or down and left or right, depending on whether the slope is
positive or negative. Draw a point, and from there, move up or down and left or right again to find a third point.4) Draw a straight line through all three points.
Example 6: Graph 2x + 5y = 10.
To graph the equation using the slope and y-intercept, write the equation in the form y = mx + b to find
the slope m and the y-intercept (0, b).2x 5y 10
2x 5y 2x 2x 10
5y 2x 10
5y 2x 10
5552yx5 2
PBCC Page 4 of 5 SLC Lake Worth Math Lab
The slope m =
the change in y rise 2 the change in x run 5 and the y-intercept is (0, 2).Now, plot the y-intercept. From there, move up or down two units (the rise) then move right or left five
units to the right (the run) to find additional points. When the slope is negative, make the change in y negative to locate points to the right of the y- intercept; make the change in x negative to locate points to the left of the y-intercept. XY (0, 2) (5, 0) XY (0, 2)(-5, 4)2m52m5
PBCC Page 5 of 5 SLC Lake Worth Math Lab
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