Write the solution set for equation 7x - 2y = 8 with this replacement set: {(1,-1),(2,3), (0,-4), (4,10)}.

A {(1,-1),(2,3), (0,-4), (4,10)}
B {(1,-1),(2,3), (0,-4)}
C {(2,3), (0,-4), (4,10)}.

Question

Write the solution set for equation 7x - 2y = 8 with this replacement set: {(1,-1),(2,3), (0,-4), (4,10)}. 

     A {(1,-1),(2,3), (0,-4), (4,10)}
      B {(1,-1),(2,3), (0,-4)}
      C {(2,3), (0,-4), (4,10)}.

phi · Answer

I guess they want you to find all pairs of numbers (x,y) that make the equation true.
for example, for the pair (4,10)   x=4  and y=10  and we replace x and y in the equation:
7*4 - 2*10
this is the same as 28-20= 8   so 7x-2y=8 when using (4,10)
do the same with the other pairs, and toss any that do not work.