STRAIGHT LINES HOMEWORK

Question

Given the equation y = 9x − 7

If x decreases by 5 units, what is the corresponding change in y?

 

Answer 1

equation is in y = mx+ b form so the slope of the line is 9.

slope = change in y/change in x, so change in y/change in x = 9.

if x changes -5, then change in y/-5 = 9, then change in y is -45.