Slope intercept form:
y = mx + b
"m" is the slope, "b" is the y-intercept (the y value when x = 0)
Since you know the slope is 5, and the y-intercept is 0, you can plug it into the equation.
y = mx + b
y = 5x + 0 or y = 5x
Slope-intercept form: y = mx + b
m = slope
b = y-intercept
The equation would be: y = 5x
There is no y-intercept, since the point is (0,0)
Have a happy thanksgiving, here's a turkey!