- X+3y=-7 -x+y=-8 solva by elimination?

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The initial value problem x dy/dx -4y = 0, y(0)=k, has an infinite number of solutions for k = -? and no solution for k -? What happens during a double v Scrotoplasty? Related rates???? Calc?? Plz somebody help me with this math question(P:posibility):
If P(A-B)=1/7 and P(B-A)=3/7 , what is the maximum amount of ( P(A) / P (B) )? For what number does the principal square root exceed eight times the number by the largest amount?