these are in y=mx+b form where m=slope sometimes b=0
vertical intercept means the y-intercept and the horizonatl intercept is the x intercept so the x intercept is when y=0 and the y intercept is when x=0 so the first one is
y=5x-15 slope=5 y-intercept=-15 x-intercept=3
y=7-x this can be written as y=-1x+7 slope=-1 y-intercept=7 x-intercept=7
4x=2y=12 we must get it into slope intercept form divide the whole thing by 2x=y=12 we can disregard the 12 and get 2x=y or y=2x+0 slope=2 y-intercept=0 x-intercept=0
