The Inverse
What is the inverse operation of addition?
Subtraction
If x = 3, what is 2x + 9, looks like?
2(3) + 9
In 2x + 10 = 14, what is the value of x?
2
What property is used in solving x + 5 = 14?
SPE - Subtraction Property of Equality
A teacher bought 6 identical notebooks for $42. How much did each notebook cost?
$7
What is the inverse of -2?
2
If x = 10, what is the value of x in 2x + 7?
10
Marcos has 5 pencils left after giving away 24 pencils. How many pencils did he have originally? What is the linear equation for the problem and what is the missing number?
x - 24 = 5
There were 29 pencils originally.
Sofia had some money. Her mother gave her $18. She now has $45. How much money did Sofia have originally? State the linear equation and your answer.
x + 18 = 45
Sofia has $27.
Jasmine saved the same amount of money each week for 8 weeks. Her total savings reached $136. How much did she save each week?
$17
What is the inverse of -(-8)?
-8
In 3(5) - 14 = 23, what value is given to x?
5
If m = -1, what is the value of 12x2 + x?
11
Daniel had some stickers. He gave 16 stickers to his friend and had 29 stickers left. How many stickers did Daniel have originally? What is the linear equation and state your answer?
s - 16 = 29
Daniel had 45 stickers originally.
A science experiment recorded a temperature change of −48°F over 6 equal time intervals. If the temperature changed by the same amount during each interval, what was the temperature change per interval?
-80F