Question

X^2+y^2=29,x2-y^2=21

Answer 1

x²+y²=29
x²-y²=21   /+
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2.x²=50, x²=25,/x/=5
a)x1=5,y1=2, -2    /x,y/=/5,2/,/x,y/=/5,-2/
b)x2=-5,y2=2, -2   /x,y/=/-5,2/,/x,y/=/-5,-2/