I don’t understand the question
If you mean
7m-4
M=8, this is the solution
7(8)-4
56-4
=52
But if you mean
7m- - 4
As in - + - = +
Then this is your answer
7(8)+4
56+4
=60
1/3 with a line over the answer ( 0.66666666666...)
3/4...there’s no work to show
The y intercept is zero because it crosses the y axis at 0
