Remember that the slope intercept formula is:
y = mx + b
m is the slope
b is the y-intercept
We know that the slope of the line (m) will be -5
y = -5x + b
Now we must find b
To do that you must plug in the point the line goes through in the x and y of the equation.
(-2, 7)
7 = -5(-2) + b
7 = 10 + b
-3 = b
y = -5x - 3
Hope this helped!
~Just a girl in love with Shawn Mendes