Question

quiero resolver esta ecuacion
11x+8y=7
10+7y=5

Answer 1

11x + 8y = 7 ×7
10 + 7y = 5 ×-8
_________
77x + 56y = 49
-80 -56y = -40

77x = 49 - 40 + 80
77x = -9 + 80
77x = 71
x = 71/77