exam Maths Puzzle Numerical Ability

Solve the pair of equations:

x/a + y/b = 2
ax - by = a^2 - b^2

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exam Other Question

by using subsitution of linear systems how do you figure out this problem?

x+y=4
-5+2y=-6

PLEASE HELP CUZ IM NOT UNDERSTANING THIS Given f(x)=x^2+2x+1 find f(x+h) and simplify how can i figure this out if only f is given to me and not h?