Answer:
54
Explanation:
7x + 11y = 141 eq.1
8x - 12y = -60 eq.2
multiply eq.1 by -8 and eq.2 by 7 to eliminate x
-8(7x + 11y = 141) -56x - 88y = -1128 eq.3
7(8x - 12y = -60) 56x - 84y = -420 eq.4
add equations 3 & 4
-172y = -1548
y = 9
substitute y = 9 to any of the equations, to get the value of x
I use equation 1
7x + 11y = 141
7x + 11(9) = 141
7x + 99 = 141
7x = 42
x = 6
Determine the value of x² + 2y
6² + 2(9) = 36 + 18 = 54