Question

diketahui persamaan linear -2x+3y=-9 dan 4x-5y=15, nilai 2x+4y adalah​

Answer 1

Eliminasi

-2x + 3y = -9 (×2)

4x - 5y = 15 (×1)

jadi

-4x + 6y = -18

4x - 5y = 15

___________ +

y = -3

Substitusi

-2x + 3y = -9

-2x + 3(-3) = -9

-2x - 9 = -9

-2x = -9 + 9

-2x = 0

x = 0/-2

x = 0

Maka

• 2x + 4y
• 2(0) + 4(-3)
• 0 + (-12)
• -12