exam Maths Puzzle Numerical Ability

cant figure this out (5x+y)/a=2,for a

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exam Other Question

Can someone show me how to solve by the substitution method. Thanks!

4X - y = -3
y = 4X + 3
write a polynomial function with the given zeros.
1.2,3,-3,1
2.0,-8,2
3.-10,0,2