Properties of Equality
Which property of equality needs to be used to solve for x?
6 + x = 12
subtraction
Solving Equations
Solve for x.
x + 3 = 7
What is:
x = 4
The identical inequality of x > 23 is 23 < x
True
Which property of equality needs to be used to solve for y?
20y = 40
division
Solving Equations
Solve for x.
2x = 14
What is:
x = 7
The identical inequality of 6 < m is 6 > m
False
Which property of equality is being shown in the example below?
18 - 18 + j = 35 - 18
subtraction
Solving Equations
Solve for x.
9 + x = 15
What is:
x = 6
The inequality 3x > 5 is identical to...
5 < 3x
Which property of equality needs to be used to solve for g?
g/42 = 30
multiplication
Solve for v.
9v = 27
v= 3
y > 72 is identical to 72 < y
True
Look at how this student solved the equation below:
4d = 32
4 x 4d = 32 x 4
d = 128
Did they use the correct property of equality? Explain.
No they used multiplication. They should have used division because division is the inverse operation of multiplication.
Solve for r.
r/25 = 5
r = 125
Inequalities only have one solution, just like equations.
False. Inequalities have infinitely many solutions.