Expressions and Equations

What is the difference in an expression and an equation?

• Expressions have an equal sign and equations do not.

• Equations have an equal sign and expressions do not.

The objective when solving an equation is to. . . . .

• Check the solution

• Isolate the variable

• Guess and check

• Hope you get the right answer

Simplify the expression 12x + 9 - 3x - 4

• 15x + 5

• 9x + 13

• 9x + 5

• 15x - 13

Simplify the expression 3(x - 4) + 5x

• -7x

• 2x - 4

• 8x - 4

• 8x - 12

Find the sum.

(2m + 7) + (-3 + 4m)

• 6m + 10

• 6m + 4

• 2m + 10

• 2m + 4

Find the sum.

6(-2.1k - 2) + 7k + 5

• -5.6k - 7

• -19k - 17

• 5.6k + 7

• -19k + 17

Solve the equation. Check you solution. b - 6 = -11

Solve the equation. Check your solution.

-2.5 + w = 3.7

Solve the equation. Check your solution.

 $\frac{n}{-5\ \ \ }\ =\ 7$  

• n = 35

• n = 2 

• n = -35

• n = 12

Solve the equation. Check your solution.

-2.9 = 7f - 4.3