book Maths Puzzle Numerical Ability

How do you do y= 2x + 3 using substitution?
y= 3x + 1

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book Other Question

find 4 consecutive even numbers so that the products of the second and the fourth is greater than the product of the first and third by 36? abcd is quadrilateral ab=x, ad =x+1, bc=9 and cd=2x+5 what is the value of x if the perimeter of quadrilateral of abcd is 35