8R Unit 1 Test Review!

Find the value of the expression below when n = 2.

5 + 3n

• 16

• 11

Answer explanation

PLUG IN 2 for n using parentheses, and then type the expression into your calculator!

5 + 3(2)

Which equation has the solution x = 4?

• 5x + 4 = -24

• 6x - 4 = 20

Answer explanation

PLUG IN!

5(4) + 4 = 24 (NOT -24!)

6(4) - 4 = 20 CORRECT!

When you combine like terms for the equation below, what will be the resulting equation?

3x + 6 + 7x + 3 = -13

• 10x + 9 = -13

• -4x + 9 = -13

Answer explanation

Combine the x's:

3x + 7x --> 10x

Combine the constants:

6 + 3 --> 9

What should be your FIRST STEP to cancel the "x" on the right side of the equation?

8x - 10 = -2x + 5

• Subtract 2x on both sides.

• Add 2x on both sides.

Answer explanation

To CANCEL, we use the OPPOSITE operation.

The opposite of -2x is +2x!

Which of the following best describes the solution to the equation below?

3x + 13 = 3x + 13

• There is no solution.

• There are infinitely many solutions.

Answer explanation

EXACT SAME THING ON BOTH SIDES! --> infinitely many

Coefficients of x are the same (both 3) and the constants are the same (both 13).

Which of the following best describes the solution to the equation below?

8x + 2 = 8x + 6

• There is no solution.

• There are infinitely many solutions.

Answer explanation

Coefficients of x are the same (both 8) but the constants are NOT (2 and 6) -->

NO solution!

Which property was used to simplify the expression shown below?

Line 1: 4(x + 3)

Line 2: 4x + 12

• commutative property

• associative property

• multiplicative inverse property

• distributive property

Answer explanation

Puppy A weighs 8 pounds and grows 2.5 pounds per week. 

Puppy B weighs 6 pounds and grows 2.75 pounds per week.

Which equation can be used to determine, algebraically, after how many weeks, x, Puppy A and Puppy B will be the same weight?

• 8x + 2.5 = 6x + 2.75

• 2.5x + 8 = 2.75x + 6

Answer explanation

"x," which represents the NUMBER OF WEEKS, must go with the "PER WEEK" number!

• -13

• 0

• -0

• undefined

Answer explanation

"Divide by 0 error" means UNDEFINED!

When is the Unit 1 Test?

• Today

• Tomorrow

• There's a test?!?!