Find the slope and the y-intercept -8x-7y equals 21?

-8x-7y = 21

First let's separate the y and x and try to get the equation in the form of Y=mX+B (m is the slope and B is the y-intercept)

-8x-21=7y (we simply added 7y to both sides and subtracted 21 to both sides of the equation)

Now let's divide by 7 to both sides

-(8/7)X-(21/7)=(7/7)Y

to yield....

-(8/7)-3=Y, so our slope is -(8/7) and our slope is -3