Unit 4 Summative Assessment 8th grade

Question

What is the equation of a line that passes through the points (0, 5) and (4, 8)? Write your answer in slope intercept form

Answer 1

(0,5) or y= 5 is the y intercept = the value of y when x = 0

slope = "rise over run" = change in y over change in x coordinates = (8-5)(4-0) = 3/4

the equation in slope intercept form is y=mx + b where m= slope = 3/4 and b = y intercept = 5

or substituting m=3/4, b = 5, to get

y =(3/4)x + 5