# Question #80bc9

##### 1 Answer

Jan 8, 2017

#### Answer:

Sand is $3 per bag and pea gravel is $4 per bag.

#### Explanation:

This is an example of solving two equations in two unknowns. Each purchase must be "translated" into an equation:

If we use X for the sand and Y for the pea gravel, the two purchases can be written as

The second equation simplifies (divide each side by 2) into

so, sand is $3 per bag.

Now, place this value into the other equation:

Pea gravel is $4 per bag.