7th Grade Algebra: Evaluate Expressions & Graph Lines

A store sells pencils for $0.50 each. If you buy x pencils, write an expression for the total cost. Evaluate the expression for x = 10.

• $2.50

• 5.00

• $4.00

• $6.50

Maria has 3 times as many marbles as John. If John has y marbles, write an equation to represent the number of marbles Maria has. If y = 5, how many marbles does Maria have?

• 20

• 15

• 10

• 5

A car rental company charges a flat fee of $20 plus $0.15 per mile driven. Write an expression for the total cost C for driving m miles. Evaluate C when m = 100.

• $50

• $15

• $100

• 35

The perimeter P of a rectangle is given by the equation P = 2l + 2w, where l is the length and w is the width. If the length is 8 and the width is w, find the perimeter.

• 2(8 + w)

• 2l + w

• 16 + w

• 16 + 2w

A school is planning a field trip. The cost per student is $15, and there are s students attending. Write an expression for the total cost T. If s = 30, what is T?

• 450

• 4500

• 600

• 300

A linear equation is represented by y = 2x + 3. Graph this equation by plotting points for x = -2, -1, 0, 1, and 2. What are the coordinates of the points you plotted?

• (-2, 5)

• (-1, 3)

• (0, 1)

• The coordinates of the points plotted are [(-2, -1), (-1, 1), (0, 3), (1, 5), (2, 7)]

The sum of two numbers is 12. If one number is x, write an equation for the other number. If x = 7, what is the other number?

• 5

• 6

• 4

• 3

A gardener is planting flowers in rows. If each row has 4 flowers and there are r rows, write an expression for the total number of flowers. Evaluate for r = 5.

• 20

• 16

• 30

• 24

A movie theater sells tickets for $8 each. If t tickets are sold, write an expression for the total revenue R. If t = 50, what is R?

• 200

• 400

• 1000

• 600

The equation of a line is given as y = -x + 4. Graph this equation by finding the y-intercept and one other point. What are the coordinates of the points you found?

• (0, 0) and (4, 0)

• (2, 4) and (4, 2)

• (1, 3) and (3, 1)

• The coordinates of the points found are (0, 4) and (2, 2).