Which is the slope intercept form of an equation for the line containing (0,-3) with slope - 1

y = - 1x + (-3) or y = - 1x-3 (because a positive and negative sign together equal a negative)

Step-by-step explanation:

The slope-intercept form is y=mx+b. In the equation for slope-intercept form m=slope and b=y-intercept. You have the slope and y-intercept so all you have to do is put them in the right places. Since the slope is - 1 your put the - 1 where the m is and get y=-1x+b. Then since you know the y-intercept is (0,-3) = - 3 then you just need to put the - 3 where the b is to get y = - 1x + (-3).