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y = -3x + 5 (persamaan 1)
Subtitusikan persamaan 1 ke 2x + 3y - 8 = 0
2x + 3(-3x + 5) - 8 = 0
2x + -9x + 15 - 8 = 0
-7x + 7 = 0
-7x = -7
x = -7/-7
x = 1
y = -3x + 5
y = -3(1) + 5
y = -3 + 5
y = 2
(x + y)² = (1 + 2)² = 3² = 9