M7 Topic 4 Study Guide

What is the difference between an equation and an expression?

• An equation has an equal sign and an expression does not.
• An expression has an equal sign and an equation does not.
• This must be a trick! They are the same thing!
• One has variables and the other does not.

 2(-8+7c) 

• 16+14c
• 30c
• -23c
• 14c+(-16)

4+(-7)-10x+5x

• -5x-3
• 24+35x
• -6-15x
• 15x+3

 6(-4+3)+5v+10v

• 9v
• 21v
• 6+15v
• -6+15v

Write the expression for the perimeter of the rectangle

• 6x - 6
• 4x + 10
• 8x - 8
• 3x - 3

Which of the following does NOT represent an equivalent expression for 8x+4?

• 4(2x+1)
• (2x+1)+(2x+1)+(2x+1)+(2x+1)
• 2(4x+2)
• 2x(4+2)

Which of the following does NOT represent an equivalent expression for 15p+9?

• 3(5p+3)
• (5p+3)+(5p+3)+(5p+3)
• (20p-5p)+(3x3)
• (3p+3p+3p+3p)+(3+3+3)

Find the equivalent expression for 7-3(2x+5)

• 4(2x+5)
• -6x-8
• 7-3(7x)
• 7-6x+5

Which equation has x=9 as a solution

• 4 + x = 12
• 5x = 45
• 2x = 20
• x + 7 = 26

Working together, Joy and Steve collected 53 pounds of aluminum cans for recycling. If Joy collected 20 pounds, find the number of pounds, x, that Steve collected. Using x as your variable write an equation to solve.

• 20x=53
• x-20=53
• x-53=20
• x+20=53