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Big Ideas Math: Modeling Real Life, Grade 8 View details

7. Writing Equations in Point-Slope Form

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Exercise 1 Page 180

Point-slope form is y-y_1=m(x-x_1).

y-2=-4(x-1)

Practice makes perfect

An equation in point-slope form follows a specific format. y- y_1= m(x- x_1) In this format, m represents the slope and the point ( x_1, y_1) lies on the line. We are given the point ( 1, 2) and the slope -4, so we have everything we need to create a point-slope form equation.

y-y_1=m(x-x_1)

SubstituteValues

Substitute values

y- 2= -4(x- 1)

Please note that any point on the line can be used to form a point-slope equation. Therefore, our equation is only one of infinitely many possible equations!