y=mx+b is the slope-intercept equation where m is the slope of a line and b is the y value of an x intercept. to solve for slope we have (y1-y2)/(x1-x2) where y1 and y2 are y values of 2 points, and x1 and x2 the x values of those points. so we have (0,5) and (3,4). These can be plugged in to get (5-4)/(0-3) or -1/3. then this is plugged in along with 5 for the x intercept to get y=-1/3*x+5 as the answer for 6. Completing the same process for the slope of #7 we can get (-12-(-2))/(0-8) or -10/-8 or 5/4. Again we plug in to get y=5/4*x-12 as the answer for 7.
