Question

Evaluate 2x − 4 for x = 9. Evaluate −b + 8 for b = 3. Find the value of the expression 12x+3 if x = 12. For the equation y = 3x + 4, find the value of y if x = 2. The expression $25 + $10h gives the amount of money that Stephanie earns per day, where h is the number of hours she works. How much does she earn if she works 4 hours? Simplify each of the following expressions: 3(x + 2) + 4(x − 2) 2(x + y) − 3(x + y) −(y + 8) + 4(6 − y) 2(4x + 3) − 3(x + 1)

Answer 1

Answers are below and bolded for you. Questions are underlined.

Explanation:

Evaluate 2x − 4 for x = 9.

2×9-4=

18-4=

16

Evaluate −b + 8 for b = 3.

-3+8=

5

Find the value of the expression 12x+3 if x = 12.

12×12+3=

144+3=

147

For the equation y = 3x + 4, find the value of y if x = 2.

y=3×2+4

y=6+4

y=10

The expression $25 + $10h gives the amount of money that Stephanie earns per day, where h is the number of hours she works. How much does she earn if she works 4 hours?

If she works 4 hours, our equations is now:

$25+$10×4=

$25+$40=

$65

Simplify each of the following expressions:

3(x + 2) + 4(x − 2)=

3x+6+4x-8=

7x-2

2(x + y) − 3(x + y) −(y + 8) + 4(6 − y)=

2x+2y-3x+3y-y+8+24-y=

-x+2y+3y-y+8+24-y=

-x+4y+8+24-y=

-x+3y+32 or 32-x+3y

2(4x + 3) − 3(x + 1)=

8x+6-3x+3=

5x+9