Question

Persamaan linear ax-2y=-12. 4x+by=-5 penyelesaian sistem persamaan tersebut adalah (-2,3)tentukan nilai a+b

Answer 1

(-2, 3) --> ax - 2y = -12
-2a - 2 × 3 = -12
-2a - 6 = -12
-2a = -12 + 6
-2a = -6
a = -6 : (-2)
a = 3

(-2, 3) --> 4x + by = -5
4 × (-2) + 3b = -5
-8 + 3b = -5
3b = -5 + 8
3b = 3
b = 3 : 3
b = 1

a + b = 3 + 1 = 4