exam Maths Puzzle Numerical Ability

I accidentally asked the same question twice could someone please help with this graphing question?

Solve the following system of equations by graphing: y=x-4
2y=-x+10

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exam Other Question

If a man deposits $150 at the end of each 3 month period and if interest is at 7% per year compounded quarterly, how much money will he accumulate in 25 years? Find the following product:

a(a + 5)(a - 5)