1. y= x+3 y= 9-x² 2. y²+2x= 7 y-2y= -7 3.3x²+2y²= 25 x+y= 5

y = x +3, y = 9-x^2
x + 3 = 9 - x^2
x^2 + x -6 = 0
( x +3)(x -2) = 0
x1 = -3 atau x 2= 2
y1 = -3 + 3 = 0
y2 = 2 + 3 = 5
HP = { (-3, 0),(2, 5) }
3) 3x^2 + 2y^2 = 25 dan x + y = 5=> y = 5-x
3x^2 + 2(5-x)^2 = 25
3x^2 + 2x^2 -20x +50 = 25
5x^2 -20x +25 = 0
x^2-4x +5 = 0. mungkin soal salah