Question

Diketahui sistem persamaan x-5y=-7 dan 3x-2y=-8. Nilai 6x+4y adalah....
mksih,,

Answer 1

X - 5y = -7 dan 3x - 2y = -8

x = -7 + 5y substitusi ke 3x - 2y = -8
3x - 2y = -8
3(-7 + 5y) - 2y = -8
-21 + 15y - 2y = -8
13y = -8 + 21
13y = 13
y = 13/13
y = 1

y = 1 subsitusi ke x - 5y = -7
x - 5y = -7
x - 5(1) = -7
x - 5 = -7
x = -7 + 5
x = -2

HP = {-2,1}