Question 1175867
you start with y = 250 + 340x
you're good until:
(y - 250) / 340 = x
your last step in the table isn't correct.
it should be:
(8750 - 250) / 340 = x
that's because you replaced y with 8750 that it is equal to.
that step would be called substitution.
you then perform the simplification to get:
25 = x
that's your solution.