wcj2281
wcj2281
27-11-2017
Mathematics
contestada
X^2+y^2=49 , y=7-x solve it in substitution
Respuesta :
emar8092
emar8092
27-11-2017
x^2+(7-x)^2=49
x^2+x^2-14x+49=49
2x^2-14x=0
2x(x-7)=0
x=0, x=7
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