exam Maths Puzzle Numerical Ability

solve each systems of equations algebraically
28. {2x+4y=10}
{3x-4y=-15}

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exam Other Question
Given just the slop of two lines, how can I tell if they lines are perpendicular? Parallel? Hopeless need help!
express with only positive exponents??????????
a)
x^2-2x-15/x^2-x-6 divide x^2-5x/x^2-4

b)
6/x-1 subtract x+2/x

c)
(x+3)^2-2(x+1)

d)
{3y^2z/x^