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y= 4-x
x²+x+1 = 4-x
x²+x+x+1-4=0
x²+2x-3=0
(x+3)(x-1)=0
x=-3 x=1
2) y= 15x²+21-11
y= 2x-1
15x²+21-11 = 2x-1
15x²-2x+21-11+1=0
15x²-2x+11=0
hehhee maaf gak lngkap ..soalnya dlu gak tuliss