A store sells
3 pens in a package. There are 12 packages
of pens in a box. Write an equation to
model the number of pens in a box. Use the
equation to write another equation that
uses the Subtraction Property of Equality.
Explain how the equation is balanced.

36

Step-by-step explanation:

Total number of packages = 12

Each package contains 3 pens

SO we can write the equation as follows

3 * 12 = 36

so the total no of pens in a box = 36

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation: