Answer:
y = x - 20
Explanation:
You want the equation of a line with y-intercept -20 and x-intercept 20.
Slope
The line rises 20 units from y= -20 to y=0 as it runs 20 units from x=0 to x=20. That means the slope is ...
m = rise/run = 20/20 = 1
Intercept
The y-intercept is where the line crosses the y-axis, at y=-20.
Equation
The slope-intercept equation is ...
y = mx +b . . . . . where m is the slope, and b is the y-intercept
For a slope of 1 and a y-intercept of -20, the equation is ...
y = 1·x -20 . . . . fill in m and b
y = x -20 . . . . . simplified equation