book Maths Puzzle Numerical Ability

solve the systems of equations by finding the inverse of the coefficient matrix

3x-y= 5
2x+3y= 1

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book Other Question

What is the vertex of this parabola? (x-4)^2=2y Which Statement is true if n is a whole number?

a. if 20/n=5, then n/5=4
b.if 20-n=5, then n/5=4
c.if 5 x n=20, then n+5=25
d.if 20/n=5, then 20/5+n