Question

3x+5y=-6 dan -2x+3y=23

Gunakan cara Gabuungan Elminasi & Substitusi

Answer 1

a.metode eliminasi
3x+5y=-6(2)
-2x+3y=23(-3)

6x+10y=-12 - 6x+(-3y)=-69=7y=-57

maaf kalau salah

Answer 2

Eliminasi y:
3x+5y=-6 } dikali 3 => 9x+15y=-18
-2x+3y=23 } dikali 5 => -10x+15y=115

(9x+15y=-18) - (-10x+15y=115) = (19x+0=-133) = (x=-133÷19) => x=7

substitusi x:
3x+5y=-6 => 3(7)+5y=-6 => 21+5y=-6 => 5y=-6-21 => y=-21÷5 => y=-4,2