exam Maths Puzzle Numerical Ability

I was given an equation of a line and a point and told to determine whether the point is on the line using substitution. Heres two problems


y=x-4;A(5,1)




y=4x+2;A(1,6)

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exam Other Question

3x^2 + 7x + 2 Would you please help me with this problem ;0).
x over x-2, subtract x+1 over x = 8 over x^2-2x

I think the LCD is x^2-2x. I am lost from here. Thank you for your help.