Question

Which is not a solution to the equation -3x+y=5 ?

Answer 1

-3x+y=5
y=5+3x

Then:
if x=-4;  y=5+3(-4)=5-12=-7  This is a possible solution .
if x=3; y=5+3(3)=5+9=14  This is other possible solution.
if x=2; y=5+3(2)=5+6=11, it´s not solution.
if x=1; y=5+3(1)=5+3=8; this is other possible solution.

C. (2,-1)