y=10+x(0.5)
This is the way of writing that equation.
There are 2 methods you are taught in Middle School.
Elimination and Substitution.
Answer:

Step-by-step explanation:
Slope = m = -4
Y-intercept = c = -7 ( Because that is the point where x = 0 )
<u>Equation:</u>

So, The co-efficient of x is -4.
![\rule[225]{225}{2}](https://tex.z-dn.net/?f=%5Crule%5B225%5D%7B225%7D%7B2%7D)
Hope this helped!
<h3>~AH1807</h3>