Question

b) x + 2y = 6
x ao quadrado- y = 2

Answer 1

x+2y= 6
x²-y= 2
x= 6-2y
(6-2y)²= 6
6²-24y+4y²-6= 0
36-24y+4y²-6= 0
4y²-24y+30= 0 (:2)
2y²-12y+15= 0
∆= (-12)²-4.2.15
∆= 144-120
∆= 24
y= 12±2√6/4
y'= 12+2√6/4
y"= 12-2√6/4
espero ter ajudado