book Maths Puzzle Numerical Ability

can you please help me with this question?

y-(y+3)=y+6

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book Other Question

Find the slope of the line for: "y= -5" and also "y=9x+2". Please help me with this problem on page 402...Thank you very much.

1/5x+3/5y=12/5

-1/5x+3/5y=6/5