8th Grade Math Testlet #2 - Slope-Intercept Form

A taxi charges $5.00 plus $0.75 per mile for a ride.

Which equation could be used to represent the total cost, c, in dollars, for a taxi ride of m miles?

• c = 4.25m

• c = 5.75m

• c = 0.75m + 5

• c = 5m + 0.75

Answer explanation

The taxi fee is $5.00 which is your y-intercept. Each mile costs $0.75, so that is your slope.

Tags

CCSS.HSF-BF.A.1A

What is the equation of the line that passes through the points (0, 5) and (10, 1)?

• y = -2/5x + 5

• y = -5/2x + 5

• y = -2/5x - 5

• y = -5/2x - 5

Answer explanation

Slope is calculated by dividing rise over run.

Calculate the change in y (y2-y1) divided by the change in x (x2-x1).

Tags

CCSS.8.EE.B.6

CCSS.8.F.B.4

A table of values is shown.

Which equation represents the table of values?

• y = 4x – 18

• y = 4x + 46

• y = 1/4x +12

• y = 1/4x +16

Tags

CCSS.6.EE.C.9

Graham draws a straight line through the points (5, 0) and (0, 4).

Which equation represents Graham’s line?

• y = 4/5x + 4

• y = -4/5x + 4

• y = 5/4x + 5

• y = -5/4x + 5

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

CCSS.8.F.B.4

Juan is ordering T-shirts. The table shows the cost for ordering different numbers of T-shirts.

Write an equation in slope-intercept form that Juan can use to model the cost, y, of ordering x T-shirts

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Write an equation in slope-intercept form for a line with a slope of –3 and a y-intercept of 5.

• y = -3x + 5

• y = 5x -3

• y = -3x - 5

• y = -5x -3

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

Bryan is training for a race. The table shows how many miles he runs each day.

Write an equation that can be used to determine the number of miles, y, Bryan runs on day x.

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2