exam Maths Puzzle Numerical Ability

please help me solve this equation by substitution
y=2x+3
y=3x+1

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exam Other Question

9-(-2)(-7)= x^3y+2x^2y^2+xy^3

I came up with the answer can you let me knwo if i am correct
x(x^2y+y^3+2xy^2)
xy(x^2+y^2+2xy)