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Verified answer
1x²+y²=25
y=2x
x²+(2x)²=25
x²+4x²=25
5x²=25
x²=5
x=√5
x²+y²=25
(√5)²+y²=25
5+y²=25
y²=20
y=√20
y=2√5
2)
x²+y=9
x-y+3=0
x²+y=9
x-y=-3
y=x+3
x²+y=9
x²+x+3=9
x²+x-6=0
(x-2)(x+3)
x1=2 V x2=-3
y1=x1+3
y1=2+3
y1=5
y2=x2+3
y2=-3+3
y2=0
3)
x²-y=1 x -3
2x²+3y=17 x 1
-3x²+3y=-3
2x²+3y=17
3y=17-2x²
-3x²+17-2x²=-3
-5x²=-20
x²=4
x=√4
x=2
x²-y=1
2²-y=1
4-y=1
y=3
4)
x²-2y=1
x²+5y=29 -
-7y=-28
y=4
x²-2y=1
x²-2(4)=1
x²-8=1
x²=9
x=√9
x=3
5)
3x²-y²=11 x 1
x²+4y²=8 x 3
3x²-y²=11
3x²+12y²=24 -
-13y²=-13
y²=1
y=√1
y=1
x²+4y²=8
x²+4(1)²=8
x²=4
x=√4
x=2
6)
x-y²+3=0
2x²+y²-4=0
x-y²=-3
2x²+y²=4 +
2x²+x=1
2x²+x-1=0
(x+2)(x-1)
x1=-2 V x2=1
x1-y1²+3=0
-2-y1²+3=0
-y1²=-1
y1²=1
y1=√1
y1=1
x2-y2²+3=0
1-y2²+3=0
-y2²=-4
y2²=4
y2=√4
y2=2
7)
2x²+4y=13 x 1
x²-y²=7/2 x 2
2x²+4y=13
2x²-2y²=7 -
4y+2y²=6
y²+2y-3=0
(y+3)(y-1)
y1=-3 V y2=1
2x1²+4y1=13
2x1²+4(-3)=13
2x1²-12=13
2x1²=25
x1²=25/2
x1=√25/2
x1=5/√2
x1=5√2/2
2x2²+4y2=13
2x2²+4(1)=13
2x2²=9
x2²=9/2
x2=√9/2
x2=3/√2
x2=3√2/2
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