exam Maths Puzzle Numerical Ability

Solve the system by substitution. x + y = 12 y = 2x

Solve the system by addition or substitution. 3x - 4y = 8 6x - 2y = 10

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exam Other Question

y=(y2 - y1 / x2 - y1)x+b

If you could please show the steps to how you solved this I would appreciate it.

Thanks How many times might a circle and a square intersect/be tangent?