Find the Equation of a Line: example 4.61

Find an equation of a horizontal line that contains the point $(−1, 2)$ . Write the equation in slope–intercept form.

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

Find an equation of a horizontal line containing the point $(−3, 8)$ .

How did it go?

Identify the slope.
Identify the point.
Substitute the values into $y - y_{1} = m (x - x_{1}) .$

Simplify.


Write in slope–intercept form.	It is in y-form, but could be written $y = 0 x + 2$ .

Identify the slope.
Identify the point.
Substitute the values into $y - y_{1} = m (x - x_{1}) .$

Simplify.


Write in slope–intercept form.	It is in y-form, but could be written $y = 0 x + 2$ .