9 and 12 are slope-intercept form and 10 and 11 are point-slope form
m angle 6= 210
I'm not sure about this question
B but I'm not as sure though
I like the substitution method. Which is when you make one equation equal only x or y and plug it into the other equation)
There is also the graphing method. If you graphed it, it might not be quite as accurate (at least on hand, on computer you would be pretty exact)
Then there is the elimination method. You multiply one of the equations by a coefficient so that you can eliminate x or y from the equation.
