book Maths Puzzle Numerical Ability

I am having trouble with this graphing homework, Please help, My question is this Rewrite the equation 4x+4y=20 in slope intercept form? Please help me if you can, it will be greatly appreciated!

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book Other Question
Solve each system by the substitution method. Indicate whether each system is independent, inconsistent, or dependent.
x - y = 3
3x - 2y = 3


3y = x + 5
3x - 9y = -10


x This question is actually about elimination because there werent any catorgories for elimination. My question is:
4x-2y=-14
3x-y=-8

My answer was (-2 7/10 ,-12 4/10) but I don