exam Maths Puzzle Numerical Ability

Solve the folowing system.
x - y = 1
x + y = 1

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exam Other Question

Draw the graph of a line with y-intersept 5 and slope of 7/5. I need help factoring a polynomial please...I can do it with numbers, but the letters through me off.
a+a^2b^2+a^3b^3

Thanks for your help.