8th Grade Using Linear Models to Predict Quiz: 10 Questions with Explanations

A y is 4 when x is 0B x increases 4 for each 1 of yC y increases 4 for each 1-unit increase in xD y is 9 when x is 4

The slope is the change in y per 1 unit of x.

A the predicted y when x is 0B the rate of changeC the predicted x when y is 0D the largest value of y

The intercept is where the line crosses the y-axis.

A 15B 16C 40D 25

2.5 x 6 + 10 = 25.

A 31 cmB 16 cmC 15 cmD 35 cm

3.2 x 5 + 15 = 31.

A 3B 9C 2D 23

(16 – 7)/(4 – 1) = 3.

A 8B 6C 17D 5

11 = 6 + b gives b = 5.

A the charge rises as hours increaseB the charge falls as hours increaseC the battery starts at 0 percentD the battery never runs out

A negative slope means y decreases as x increases.

A interpolationB associationC extrapolationD clustering

Extrapolation can be unreliable.

A 22B 6C 18D 9

20 = 3x + 2, so x = 6.

A 0.5 ft at age 0B about 0.5 ft of growth per yearC 0.5 years per footD the person is 0.5 ft tall

Slope is change in y per year.