exam Maths Puzzle Numerical Ability

How do you graph y=x+2 and y=-2x+2

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solving equations and formulas chapter 3-6 12-30 even and 34
12 ex-2y=3z for x
14 3/5 times y + a=b for y
16 y=mx+b for m
18 b times y+2 divided by 3=c for y
20 P=Esquared di
Please help solve the problem below:

5x - 2y= 4

x + 2y= 8