Multiply like this. And it gives you your answer.
7.8•7.8•7.8
Answer:
Depends, rise over run could be considered a fraction, or if it's a number that has a whole number like one and 3/4 then you just plot the point to the best of your ability. In other words guess.
5x+15-6+7x
15-6= 9.
5=7= 12
12x+9 .
I'm assuming you want an equation with a slope of -5 that also passes through the point (1, -7).
An equation that fits this is

Hope this helps!