2x + 3y = 62 ; x = 5a dan y = 7a ; z = x-y ; maka nilai z =

2x + 3y = 62
2(5a) + 3(7a) = 62
10a + 21 a = 62
31 a = 62
a = 2

x = 5a
x = 5 × 2
x = 10

y = 7a
y = 7 × 2
y = 14

z = x-y
z = 10-14
z = -4

Semoga membantu :)

2x + 3y = 62
x = 5a dan y =
2(5a) + 3(7a) = 62
10a + 21a = 62
31a = 62 ---> a = 2
z = x - y
z = 5a - 7a
z = -2a
z = -4