exam Maths Puzzle Numerical Ability

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

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exam Other Question

Graph the trianlge ABC if it has the vertices A(8,6) B(-4,1) and C(2,-6) graph the triangle. Find the coordinates of J if AJ is a median of triangle ABC. If N has the coordinates (3,-4) is BN an altitude of triangle ABC? Write as a single logarithm: log 12 + log (x-2) - log 2.
I thought that I might have to turn it into exponetial form first but Im not sure.