Question

A contractor's crew can frame 3 houses in a week. How long will it take them to frame 54 houses if they frame the same number each week?
I have to write the equation in the form of y=mx+b
Would it be:
y=3x+54
y=18

Answer 1

Your equation makes no sense.

if y is the number of houses framed after x weeks, then (assuming 3 houses per week),
y = 3x
Now you want to find x such that
54 = 3x

Answer 2

no

3 houses/week * x weeks = 54 weeks
or
w= 3 x + 0
54 = 3 x
(if your work zero weeks you get 0 houses so b = 0)