Question

check by subsitituting whether x=1 and y=-2 is a solution of equation 2(x+6)-5(y+7)=-11

Answer 1

when we substitute x and y in the equation:
2(1+6)-5(-2+7)=-11
2+12+10-35=-11
14+10
24-35=-11
therefore when we solve the equation we get the answer as -11