Addition/Subtraction
Subtracting by 2 is the inverse of adding by -2
False
Solve the Equation.
10 + x = 24
10+ x - __= 24 - __
x = __
What is -10
x= 14
Tell which property of equality was used.
5m + 5 = 25
5m + 5 -7 = 25 - 7
What is subtraction property of Equality
d-7=9
What is 16
True or False
Multiplying by 7 is the inverse of adding by 7
FALSE!
Multiplying by 7 is the inverse of dividing by 7
x/4=15
What is 60
50 = x - 11
50 + __ = x - 11 + __
__ = x
+11
61 = x
Tell which property of equality was used.
10x = 50
10x / 9 = 50/ 9
Divison property of equality
n + (-8) = 14
What is 22
True or False and why
These two equations are equivalent.
8x-4=16
8x-4 + 5 = 16 + 5
True because each side is adding the same number.
5e = 400
What is 80
z - 15 = 86
z - 15 + __ = 86 + 15
z = __
15
z = 101
Tell which property of equality was used.
2x - 5 = 20
(2x - 5) -3 = 20 - 3
Subtraction property of equality
x - 327 = 665
What is 992
Tell which value of the variable is the solution of the equation.
21= 7x; x= 3,5,6,8
What is 3
28 = a/13
What is 364
Explain how to get the variable alone.
5a = 30
Divide both sides by 5.
If 8k = 64, which property of equality was used to find the equalivalent equation 8k + 3 = 64 + 3
Addition property of equality
27 = c + 27
What is 0
Tell which value of the variable is the solution of the equation.
$10.40 = $15.07 - x; x= $5.67, $7.35, $7.65, $4.67
What is $4.67
21y = 756
What is 36
p/3 = 72
p=216
Tell which property of equlity is used.
5-t = 20
5-t x 7 = 20 x 7
Multiplication property of equality