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Jawabannya lihat di lampiran ya2) 2y - 4x = -2 ===> y - 2x = -1 ===> y = 2x - 1
y = x² + x - 3
2x - 1 = x² + x - 3
x² + x - 3 - 2x + 1 = 0
x² - x - 2 = 0
(x + 1) (x - 2) = 0
x = -1 dan x = 2
Jadi utk x = -1, maka
y = 2x - 1
= 2(-1) - 1
= -2 - 1
= - 3
shg: 2a + 3b = 2(-3) + 3(-1)
= -6 - 3
= -9
utk x = 2, maka
y = 2x - 1
= 2 (2) - 1
= 3
shg: 2a + 3b = 2(2) + 3(3)
= 4 + 9
= 13
semoga jelas dan membantu ya (Gbu)