Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
2. Writing Equations in Point-Slope Form
Continue to next subchapter

Exercise 4 Page 171

Assume that (x,y) is any point that the line passes through different than the given point. Then, consider the Slope Formula to write an equation for the line.

See solution.

Practice makes perfect
Let's assume that the slope m and the point ( x_0, y_0) are given. In order to write an equation for a line that passes through ( x_0, y_0) with a slope m, we will use the Slope Formula. m = y_2-y_1/x_2-x_1 In the formula, (x_1,y_1) and (x_2,y_2) are the points that appear on the line and m is the slope of the line. Therefore, we will assume that ( x, y) is any point that our line passes through different than ( x_0, y_0). Let's apply the formula.

m=y- y_0/x- x_0 Next, we will multiply both sides of the equation by ( x- x_0) to simplify it. ( x- x_0)* m&=( x- x_0)* y- y_0/x- x_0 ( x- x_0)* m&= y- y_0 Finally, we will rearrange the equation such that the y-variable will be on the left-hand side and the x-variables will be on the right-hand side. y- y_0= m( x- x_0) As a result, we have written our equation in point-slope form.