13) 3 bags of Brand X dog food and 4 bags of Brand Y dog food costs $18,
while 4 bags of Brand X dog food and 3 bags of Brand Y dog food costs
$17. What is the cost of each bag of Brand X?

the cost of brand x dog food is $2

Step-by-step explanation:

Let brand X dog food be represented as A

Let Brand Y dog food be represented as B

3 bags of Brand X dog food and 4 bags of Brand Y dog food costs $18,

3A+4B=18

4 bags of Brand X dog food and 3 bags of Brand Y dog food costs

$17.

4A+3B= 17

Using Elimination method

Multiply

A = -14/-7= 2

Since the brand X dog food is represented as A

the cost of brand x dog food is $2

step-by-step explanation:

y=mx+b