**Algebra**

variable- a symbol which represents any unknown number

constant- integer in an Algebraic expression expression or equation

equation- only has one answer, has an equal sign

expression- has pattern, many answers

Steps to solve:

- Isolate the variable.
- Cancel the constant using zero pairs.
- Balance by doing the same operations on each side.
- Verify to check.

One-Step Equations

5) m+4=-12

Solution:

m+4=-12

m=-12-4

m=-16

Verify:

21=-7n

21=-7(-3)

21=21

27) v/7=8

Solution:

v/7=8

v/7(7)=8(7)

v=56

Verify:

v/7=8

56/7=8

8=8

Two-Step Equations

9) 5x-1=9

Solution:

5x-1=9

5x=9+1

5x=10

5x/5=10/5

x=2

Verify:

5x-1=9

5(2)-1=9

10-1=9

9=9

21) 9+9n=9

21) 9+9n=9

Solution:

9+9n=9

9n=9-9

9n=0

9n/9=0/9

n=0

Verify:

9+9n=9

9+9(0)=9

9=9

Ysabelle, You did a great jobon solving by inspection! Some of your pictures didn't make sense to me though.

ReplyDelete