book Maths Puzzle Numerical Ability

I have to solve this linear equation, and the answer will come out as an ordered pair.

1) 3x+3y=5
y=-x

2) y=-4x+4
y=-x-5

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book Other Question

2.73 with a repeating bar over the 73 is a rational number, right?
Thanks!
two angles are supplementary and congruent. how many degrees are in the measure of each angle?