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12. Y= 8x - 3. Y intercept is 3 and slope is 8 over 1.
13. Y=1. A horizontal line at y=1 so no slope.
On these problems the easiest way to do them is get y by itself and In the form of y=mx + b. m is always your slope and b is always your y-intercept.
Ps. Didn't read through the whole...