How To Solve Slope-intercept Form?

Tx+12y=-3

4y+4=4x

At 6:15 am john had run 1 mi at 6:45 he had run 4.5 mi whats his average rate of travel

Y=x+2

Y=mx+b    m=slope     b=y-intercept

Here is the link from where you can get the detail descriptions of the slope intercept forms. You can see the formula and solve the questions. Have a look:
www.purplemath.com

Y=x^3+3x-1
Using the points (1,-3)
Answer into slope intercept form