You have to determine a line that crosses through the points (4,-1) and (-1,-4)
The first step is to determine the slope of the line, to do so you have to use the following formula:

Where
m is the slope
(x₁,y₁) are the coordinates to one point on the line
(x₂,y₂) are the coordinates to a second point on the line

The slope of the line that passes through (4,-1) and (-1,-4) is m = 3/5
Now that the slope is known, you can use the point-slope form to determine the equation.

Where
(x₁,y₁) are the coordinates of one point of the line
m is the slope
Replace the formula with the slope and one of the given points, for example (4,-1)

Now you pass "1" to the right side to express the equation in slope-intercept form

The equation of the line that crosses the points (4,1) and (-1,-4) is
