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Envision Math 2.0: Grade 8, Volume 1

EM

Envision Math 2.0: Grade 8, Volume 1 View details

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Exercise 9 Page 209

Substitute the given points into the Slope Formula.

- 2/3

Practice makes perfect

We can calculate the slope by substituting the given points into the Slope Formula. m = y_2-y_1/x_2-x_1 Note that it does not matter which point we choose to use for ( x_1, y_1) and ( x_2, y_2), since the result of using the Slope Formula will be the same.

m = y_2-y_1/x_2-x_1

SubstitutePoints

Substitute ( 4,6) & ( - 2, 8)

m = 8- 4/- 2- 4

▼

Simplify right-hand side

Subtract terms

m = 4/- 6

MoveNegDenomToFrac

Put minus sign in front of fraction

m = - 4/6

a/b=.a /2./.b /2.

m = - 2/3

The slope of the line that passes through the given points is - 23.

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Review What You Know! p.209