exam Maths Puzzle Numerical Ability

How do I Graph = x-4y=8?????????????????

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Can anyone give me some help with this one? I always get the signs turned around on these. Thanks

2x + 4 = 12 solve for x

There are ABSOLUTE VALUE signs on the left of the 2x and on the right of 4. Thanks Again.
can I get help with this problem?

2(√y)-(√y-3)=(√5+y)

√= square root