book Maths Puzzle Numerical Ability

Can someone please explain to me how to graph 3x + 2y=6?? Also, here is one other question. I need to write the equation of the line which has y-intercept (0, 5) and is perpendic

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book Other Question

What is 12-7/6*15-8? Please help me solve this. Now I have the problem. I just want to check this one.

-6-(-7)-15-(-12)=?

We are coming up with -2. Is this correct?

Thanks,
Jeff