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1][
5x - 8 = 3x + 12
5x - 3x = 8 + 12
2x = 20
x = 10

x + 3 = 13 ✔

2][
x - 3y = 5
Kalikan 2
2x - 6y = 10

2x - 6y = 10
2x - 5y = 9
Kurangkan
-y = 1
y = -1 ✔

x - 3y = 5
x = 3y + 5 = -3 + 5
x = 2 ✔

3x + 2y = 6 + (-2) = 4 ✔

3][
t = 3d

5t + 10d = 125000
Bagi 5
t + 2d = 25000
3d + 2d = 25000
5d = 25000
d = 5000 ✔

t = 3d = 15000 ✔

Yg hrs dibayar Salmia
= 15t + 20d
= 225000 + 100000
= 325000 ✔