exam Maths Puzzle Numerical Ability

Find the slope and y-intercept of the line represented by the equation 2x-3y=6

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exam Other Question

-(3-10)-(6-3)
My answer is not coming out correctly.
Please see my version-

-(3+(-10))-3=
-(-7)-3=
-(-7)+(-3)= -13

The textbook gives the answer as 4. Where am I going wrong?

Thank you. I need a solution to this absolute value problem:

|5y+3| = |8y-8|

Thanks