In this case, we'll have to carry out several steps to find the solution.
Step 01:
x - 7y = 20
slope-intercept form = ?
Step 02:
Slope-intercept form of the line
y = mx + b
x - 7y = 20
x = 20 + 7y
x - 20 = 7y
7y = x - 20
The answer is:
y = x/7 - 20/7