exam Maths Puzzle Numerical Ability

after you find x, your supposed to substitue it in. I dont know how to find y.

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exam Other Question

Find an equation of the line through the points ( 1,4) and (3,10)
when dividing 12x*2-7x+18/ -4x does it make a difference in the way you work the problem because it has a negative 4? I understand how to divide it without the number being a negative. Thanks