exam Maths Puzzle Numerical Ability

I need to know how to solve this problem 125-(-p)=88 . I was told it would be more simple if I changed it to an addition problem and I also need to know how to do that

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Graph y = 4

I have to select the x-values: I am going to pick three points (-1,0,1).

So this is my table:
x=-1 y=4
x=0 y=4
x=1 y=4

My graph would look like this: Can you please help me solve this:
t + u = 7
10t + u + 9 = 10u + t
10t-t+u-10u=-9
9t-9u=-9
9(7-u)-9u=-9
63-9u-9u=-9
-18u=-9-63
u=9
t+u=7
t+9=7
t=7-9
t=-2