tolong bantu jawab pakai cara matrik

1. eliminasi
2x + 3y = 5 {x2} 4x + 6y = 10
4x - 5y = 21 {x1} 4x - 5y = 21
—————— -
y = -11
substitusi
2x + 3y = 5
2x + 3(-11) = 5
2x +(-33) = 5
2x -33 = 5
2x = 33+5
2x = 38
x = 38/2
x = 19