Inverse Operations
What is the inverse operation of subtraction?
Addition
Write the word prompt as an inequality:
The number x is less than 3
x<3
b+4<6
b<2
Draw the graph of
a<4
Open dot on 4, arrow points left
x+4=20
x=16
What is the inverse operation of addition?
Subtraction
Write the word prompt as an inequality:
The number n is greater than or equal to 4
n>=4
x-3>=24
x>=27
Draw the graph of
x>=15
Closed dot on 15, arrow points right
y-13=39
y=42
What is the inverse operation of division?
Multiplication
Write the word prompt as an inequality:
The number y minus 5 is at least 26
y-5>=26
n-15>215
n>230
Solve the inequality and graph
y-3<=6
Closed dot on 9, arrow points left
y<=6
z/4=12
z=48
What is the inverse operation of multiplication?
Division
Write the word prompt as an inequality:
Twice the number b is no more than 8
2b<=8
a+1001<=2000
a<=999
Solve the inequality and graph
x+21>42
Open dot on 21, arrow points right
x>21
4a=24
a=6
Dividing by a fraction is the same as...
Multiplying by the reciprocal
Write the word prompt as an inequality:
Half of a number p is at most -5
p/2<=-5
3/2y<=15
y<=10
Solve the inequality and graph
5<=b
Closed dot on 5, arrow points right
3y-6=15
y=7