HELP PLEASE......Write the equation in slope-intercept form of the line that has a slope of 2 and y-intercept of -2

Question

jim766 · Answer

y = mx + b    m is slope   b is y intercept, just substitute in

y = 2x - 2     make sense?

anonymous · Answer

yes thx

anonymous · Answer

1 more tho...Write the equation in slope-intercept form of the line that has a slope of 3 and contains the point (4, 9).

jim766 · Answer

in this one the give you the slope, but now y intercept, so you have to figure it out. 
but they do give you a point to use        x  y
                                                            (4, 9)
y = mx + b       we just sub in what the gave us and solve for b

9 = 3(4) + b        do you know how to get the b alone?