book Maths Puzzle Numerical Ability

How do you solve this system of equation bu using substitution 5a-b=17
3a+2b=5
I would appreciate your help. Thank

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book Other Question

A square has sides of length 3x - 2cm. Express the area of the square as a polynomial. give 2 points on the line with the givin equation, then graph the line.
y=-4x+6

i dont no how 2 do any of this