2x - 3y = 8
3x + y = 1
substitusi
y = 1 - 3x
2x - 3 (1 - 3x) = 8
2x - 3 + 9x = 8
11x = 11
x = 1
y = 1 - 3 = -2
4x + 5y
= 4 - 10
= - 6
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2x - 3y = 8
3x + y = 1
substitusi
y = 1 - 3x
2x - 3 (1 - 3x) = 8
2x - 3 + 9x = 8
11x = 11
x = 1
y = 1 - 3 = -2
4x + 5y
= 4 - 10
= - 6