Predict the result
Find a line’s equation when its slope is negative seven
and its y-intercept is the point zero comma negative one.
The two values determine a line in slope-intercept form.

Set up the model
Start with y equals m x plus b.
Use the given slope for m and the intercept’s y-coordinate for b.

Work the example
Substitute negative seven and negative one.
The equation is y equals negative seven x minus one.
At zero, the output is negative one.
Increasing x by one decreases y by seven.

Check the result
Now use slope two fifths and y-intercept the point zero comma four.
Take eight seconds to think before the answer appears.
[Eight-second silent pause to work; the answer remains hidden.]
The equation is y equals two fifths x plus four.
At zero, y is four.

Interpret the result
The equation preserves both the given intercept and the slope.
Use the original task and check that your result fits its meaning.