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Big Ideas Math: Modeling Real Life, Grade 8

BI

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

5. Estimating Quantities

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Exercise 4 Page 347

Everything necessary to use the point-slope form has been given in the problem.

y-2=- 1/3(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 graph of the line. We are given the point ( - 1, 2) and the slope - 13, 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= - 1/3(x-( - 1))

a-(- b)=a+b

y-2=- 1/3(x+1)

Subchapter links

Try It p.344-345

Self-Assessment for Concepts & Skills p.345

Self-Assessment for Problem Solving p.346

Review & Refresh p.347

Concepts, Skills, & Problem Solving p.347-348