(-1,3) 7x+2y=-1. -4x+y=15

Question

Determine whether the given ordered pair is a solution

Answer 1

Plug x=-1, y=3 to both equations,

 first equation: left side = 7*(-1) +2*3 = -1= right side

secodn equation: Left side = -4*(-1)+3 = 4+3=7≠15

So No.