They are any number in front of a variable so like 4x 7y or 8z. 4, 7 and 8 are the coefficients. A number by itself is a constant. For example 3, 1 and 9 are constants.
The slope will be -3/4 To find slope you just place the change in y over the change in x. 2- -1=3 0-4= -4 The slope is -3/4 which is the same as before
