tolong dijawab pakai cara ya besok dikumpulin plisssss

3x + 4y = -10   (x4)
4x - 5y = -34    (x3)
--------------------------
12x + 16y = -40
12x - 15y = -102
------------------------------ -
31y = 62
y = 62 / 31
y = 2

3x + 4y = -10
3x + 4(2) = -10
3x + 8 = -10
3x = -10 - 8
3x = -18
x = -18 / 3
x = -6

8x + 3y = 8(-6) + 3(2) = -48 + 6 = -42

jawaban B

itu jawaban ny
semoga cara nya dapat dimengerti