Inverse of addition is _______________, Inverse of subtraction is ___________________.
Subtraction and addition
9x - 7 = -7
x = 0
2(n+5) = -2
n = -6
6a + 5a = -11
a = -1
Aliyah had $24 to spend on seven pencils. After buying them she had $10. How much did each pencil cost?
$2
Inverse of multiplication is ___________, Inverse of division is _____________
Division and Multiplication
v/3 + 3 = 8
v = 15
7(9+k)=84
k = 3
6r - 1 + 6r = 11
r=1
You bought a magazine for $5 and four erasers. You spent a total of $25. How much did each eraser cost?
$5
Integer Rules:
1. Same Sign, ____ and _____ the same sign
2. Different signs, ___________ and _____ the sign of the bigger absolute value number
3. Double Negative becomes a big _______
4. If you're multiplying/dividing integers of the same sign, your answer will be _____________
5. If you're multiplying/dividing integers of different signs, your answer will be _____________.
1. Add and Keep
2. Subtract and Take
3. Plus
4. Positive
5. Negative
-9x + 1 = -80
x = 9
-10= 10(k-9)
k = 8
3 - 2k - 3k = -12
Maria bought seven boxes. A week later half of all her boxes were destroyed in a fire. There are now only 22 boxes left. With how many did she start?
37
Solve: -5x - 10x
-15 x
-6 = n/2 - 10
n = 8
144 = -12 (x+5)
x = -17
-12 = 2 + 5v + 2v
v = -2
Imani spent half of her weekly allowance playing mini-golf. To earn more money her parents let her wash the car for $4. What is her weekly allowance if she ended with $12?
$16
Solve: -2(y+2)
-2y - 4
-2= 2 + v/4
v = -16
-9(10+x) = -243
x = 17
3 = x + 3 - 5x
x = 0
How old am I if 400 reduced by 2 times my age is 244?
78 years old