The problem is already in standard form but to get it into slope intercept form you rewrite the equation so it looks like
6y=-5x+7 divide all by 6
y=-5/6x+7/6
slope being -5/6 and b being 7/6
I cant see all of 11 and 14
12:

13:

15:

16:
Answer:
136 °
Step-by-step explanation:
For the first one, lines one and two are perpendicular because they have opposite slopes. Parallel lines share the same slope