help me please?

Question

Solve the equation: x – 21 = 45
Show all your work Identify the Property which correctly solves the equation: x – 9 = 20.

Addition Property of Equality

Subtraction Property of Equality

Multiplication Property of Equality

Division Property of Equality
Identify the correct step to solve the equation: x – 8 = 21

Subtract 8 from both sides of the equation.

Add 8 to both sides of the equation.

Multiply both sides of the equation by 8.

Divide both sides of the equation by 8.

Answer 1

Solve the equation: x – 21 = 45
Show all your work:

x - 21 = 45 (given)

x - 21 + 21 = 45 + 21 (additive property of equality)

x = 45 + 21 (additive inverse property)

x = 76 (definition of addition)





Identify the Property which correctly solves the equation: x – 9 = 20.

Additive property of equality, like in the example above.






Identify the correct step to solve the equation: x – 8 = 21

Add 8 to both sides of the equation. That way, you can cancel the new +8 with the -8 already on the left side.

Answer 2

x – 21 = 45
x=21+45 =66

x-9 = 20
9=9
x = 29 [addition property of equality]

Add 8 to both sides getting x = 29

Answer 3

x-21=45
x-21+21=45+21
x=66
addition property of equality
x-9=20
x-9+9=20+9
x=29
addition property of equality
x-8=21
x-8+8=21+8
x=29
Add 8 to both sides of the equation.

Answer 4

x-21=45
x = 44

sub prop of equality

x-9=20
x = 11
sub prop of equalty