Equations
2x + 3 = 9
x=3
99/-9
x= -11
3x > 9
x>3
x is greater than 3
-4x < 12
x>-3
x is greater than -3
What is the inverse operation of addition?
Subtraction
3/7 x=9
What is x= 21?
-110/5
y = -22
4a + 2 < 14
a<3
a is less than 3
-3x < -18
x > 3
x is greater than 3
What is the inverse operation of multiplication?
Division
4/6 y = 20
50/-10
y = -5
3x < 39
x<13
x is less than 13
-2x + 4 < 14
x>-5
x is greater than -5
i.e.: 2x + 6 = 3
To solve this equation, what are the two steps:
1. _________
2. __________
1. Subtract the 6
2. Divide by 2
-4/5x= 24
What is x = -30?
When 854 is divided by 24, what is the remainder?
What is 14?
2r + 16 > -24
r > -20
r is greater than -20
-7x + 3 < -18
x>3
x is greater than 3
A new house that is 3,125 square feet costs $525,000 to build. What is the cost per square foot?
What is $168 per square foot?
1/3x-2=1
x=9
Doughnuts cost $9.30 per dozen. What is the approximate cost per doughnut?
What is $0.78?
7(x + 2) < 70
x < 8
x is less than 8
-6x + 3 < -18
x > 3.5
x is greater than 3.5
What should you do when dividing by a negative coefficient with inequalities?
Reverse the inequality sign