book Maths Puzzle Numerical Ability

I am supposed to find the value of x and y and do not know where to start. Here is the problem:

x-4y+22
2x+5y=-21

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book Other Question

functions
how do I solve this problem
y = x+5
the answer is......

y is equivalent to the sum of a constant c and x, where c = 5 A Cube has an edge of 3 in. what is the total area of the cube