Q1 PreCalculus Final Exam

 $16\ =\frac{k}{11}$  

The variable, k, is being divided by 11. What step needs to be completed to isolate the variable k?

• Divide both sides by 11

• Multiply both sides by 11.

• Add 11 to both sides.

• Subtract 11 to both sides.

Solve for y in the following equation:

y ÷ 3 = 12

• 36

• -36

• 4

• -4

What is the 2nd step in solving the following equation?

3x + 7 = x - 21

2x + 7 = -21

• Divide both sides by 2

• add 7 to both sides

• Subtract 7 from both sides

• Subtract 21 from both sides

What is the NEXT step in solving the following equation?

3x + 7 = x - 21

2x + 7 = -21

• 2x = -28

• 2x = 28

• 2x = 14

• 2x = -14

What is the 1st step in solving the equation?

2x - 4x = 1 - x

• -2x = 1-x

• -4x = 1 - x + 2x

• 8x = 1 - x

• 2x - 4x = 0

Which step is incorrect?

120 = 4(7a+2)

Step 1 Distribute

120 = 28a + 8

Step 2 Subtract 8 from both sides

112 = 28a

Step 3 Divide both sides by 28

a=4

• Step 1

• Step 2

• Step 3

• Problem is worked correctly

What is the 1st step in solving the equation?

2x - 4x = 1 - x

• -2x = 1-x

• -4x = 1 - x + 2x

• 8x = 1 - x

• 2x - 4x = 0

|v + 8| − 5 = 2 

• {-1,-15}
• {-1,-5}
• {-15,15}
• No Solution

-|−2r − 1| = 11

• {-6,5}
• {5,-6}
• -6
• No Solution

|−4 + 5x| = 16

• {16/5,12/5}
• {4,-5}
• {-12/5, 4}
• 4