4-1 & 4-2
Which Property of equality is being used?
if 6 + 2 = 8, then 6+2-2= 8 -2
Subtraction Property of Equality
42 = y + 15
y = ?
y = 27
5 1/2 + x = 7 1/2
x =?
x = 2
x < 10
What are THREE possibilities for what x could be:
Answers may vary: -6 , 0 , 9, -1,000 , 5
Solve: 12x = 19.2
x = 1.6
if 5 + 4 = 9, then 5 + 4 / 3 = 9 / 3
Division Property of Equality
x - 15 = 31
x =?
x = 46
x/8 = 4
x = ?
x = 32
Write an inequality sentence that represents the graph:
x is greater than or equal to 6
67 = 256 - x
x= 189
f + 12.5 = 26
f = ?
f = 13.5
45x = 270
x = ?
x = 6
25x = 5
x = ?
x=1/5

Answer: C
6x = 24
6x + 5 = 24 - 5
No solution
160 / y = 80
y = ?
y = 2
66 = a / 11
a = ?
a = 726
15.95 = 3.19n
n = ?
n = 5
Write an inequality : the measurement is greater than 23 inches
m > 23
x + 5 3/4 = 8 3/4
x = 3
a + 13.7 = 29.9
a = ?
a = 16.2
13.87 = a - 22.23
a = ?
a = 36.10
2 2/3 + y = 4 1/4
y = ?
y = 1 7/12
Write the inequality that matches the number line

x is less than or equal to -1
7/9x = 6 2/9
x = 8