The cost of 3 pencils and 2 markers is $1.30. The cost of 2 pencils and 3 markers is $1.20.
What is the total cost of 7 pencils and 7 markers?

$3.50

Step-by-step explanation:

Given that the  cost of 3 pencils and 2 markers is $1.30. Let the cost of  a pencil be $p and that of a marker be $m then

3p + 2m = 1.30

Also, the cost of 2 pencils and 3 markers is $1.20 will result

2p + 3m = 1.20

Solve both simultaneously

3p + 2m = 1.30

2p + 3m = 1.20

multiply the first by 2 and the second by 3

6p + 4m = 2.60

6p + 9m = 3.60

subtract the second from the first

4m - 9m = 2.60 - 3.60

-5m = -1

Divide both sides by -5

m = 0.20

substitute into equation 1

3p + 2(0.2) = 1.30

3p + 0.4 = 1.30

3p = 1.30 - 0.40

3p = 0.90

Divide both sides by 3

p = 0.30

The total cost of 7 pencils and 7 markers

= 0.30 * 7 + 0.20 * 7

= 2.10 + 1.40

= $3.50

2 and 1.

step-by-step explanation:

plug in each answer. 0 doesn't work, 1 does. so does 2. 4 doesn't:

0 = 1 is not true.

2 = 2 is true.

4 = 4 is true.

8 = 16 is not true.

hope this !

2nd one in the first row is correct