# Algebra IIPage 2

n + 4 = 7

n  5 = 4

n + 4 = 17

n  6 = 13

n + 7 = 15

n  8 = 17

3

9

13

19

8

9

Slide 15

## Commutative Property

5 + 4 = 9 4 + 5 = 9

a + b = c b + a = c

6 + 3 = 9 3 + 6 = 9

x+ y = z y + x = z

3 + 4 + 1 = 8 1 + 3 + 4 = 8

Slide 16

n + 7 = 7 + 4

m + 2 = 2 + 5

z + 3 = 3 + 9

g + 6 = 6 + 11

s + 4 = 4 + 20

c + 8 = 8 + 32

n = 4

m = 5

z = 9

g = 11

s = 20

c = 32

Slide 17

7 + 0 = 7

a + 0 = a

8 + 0 = 8

c + 0 = c

2 + 0 = 2

Slide 18

n + 0 = 8

b + 0 = 7

m + 0 = 3

v + 0 = 5

w + 0 = 4

r + 0 = 2

n = 8

b = 7

m = 3

v = 5

w = 4

r = 2

Slide 19

7  7 = 0

n  n = 0

4  0 = 4

n  0 = n

Slide 20

n - 8 = 0

n  9 = 0

n  0 = 7

n  0 = 9

n  7 = 0

n  0 = 5

n = 8

n = 9

n = 7

n = 9

n = 7

n = 5

Slide 21

## Write an equation for these problems using a variable

Timothy got 72 right on his timed test in July. He got 99 right on this same test in November.

Jasmin runs 15 minutes before school and 30 minutes after school.

One zinger costs 25 cents. Issak bought 4.

72 + n = 99 or 99  72 = n

15 + 30 = n

4 x 25 = n

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