exam Maths Puzzle Numerical Ability

Graph: f(x) = 2x + 2.

Thanks for any help you can provide.

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exam Other Question

Given: Ray AO is perpendicular to Ray CO
Prove: angle 1 and angle 3 are complementary angles
I have tried different things, but I do not understand this problem. the question is:
solve this system.

x-y=5
x2+y2=25