A hiker is standing 40 feet away from a tree that is 50 feet tall.
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Equation of a line in slope-intercept form:
m is the slope
b is the y-intercept
As you have the slope (m= -4) and a point (6,1) you use it in the equation above to find the y-intercept, as follow:
(6,1) x=6 y=1
m= -4
Solve b: