exam Maths Puzzle Numerical Ability

Solve the system graphically.
2x+y=12
2x+y=22

please show me how to graph this

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exam Other Question

The first three terms of the binomial expansion of (a+b)^n are 729,2916,4860 respectively, where a, b, and n are positive integers. Find a, b, n. Show working steps. Can you please help me solve the following problem:

For the given polynomial P(x) and the given c, use the remainder theorem to find P(c).

P(x) = x^2 + 12x + 31; -5

Than