The correct option is C x=115−2y5;y=112−5x2
After converting the given pairs of equations to the general form
a1x+b1y+c1=0 and a2x+b2y+c2=0,
it can be found that only for the pair x=115−2y5 ; y=112−5x2,a1a2=b1b2=c1c2, which is the condition for coincident lines with infinite solutions.