4-2 Writing Equations in Slope-Intercept Form
Tess and Jacinta are writing an equation of the line through (3, 2) and (6, 4). Is either of
them correct? Explain your reasoning.
Jacinta is correct. Both found the slope correctly. However, Tess switched the x- and y-coordinates on the point that
she entered in step 3.
Consider three points, (3, 7), ( 6, 1) and (9, p ), on the same line. Find the value of p and explain
your steps.
Find the slope of the line containing the first two points.
Use the slope and either of the first two points to solve for p. Let (x
, y
) be (9, p ) and (x
, y
) be ( 6, 1).
1
1
2
2
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