Question

Given the equation y=4x-3, if x increases by 2 unit, what is the corresponding change in y

Answer 1

y increases by 8

given y = 4x - 3 then an increase in x of 2 units gives

y = 4(x + 2) - 3 = 4x + 8 - 3 = 4x + 5

change in y = 4x + 5 - (4x - 3) = 4x + 5 - 4x + 3 = 8