linear kuadrat dari x2 - y = 5 2x + y = 3

jawab
2x + y = 3 → y = 3 - 2x

x² -  y  = 5
x² - (3 - 2x) = 5
x² + 2x - 3 - 5 = 0
x² + 2x - 8 = 0
(x + 4)(x - 2)= 0
x = - 4 atau x = 2

y =  3 - 2x
x = - 4 → y = 3 - 2(-4) = 3 +8 =11
x = 2 → y = 3 - 2(2)  = 3 - 4 = - 1

(x,y)= (-4, 11) ,(2, -1)