PLEASE I NEED HELP. At a bake sale, as student spent $11.00 buying 3 brownies and 5 cookies. His friend spent $3.95 buying 1 brownie and 2 cookies. What is the price of a brownie?

$2.25 is the cost of a brownie

Step-by-step explanation:

The key to this equation is a elimination.

Give brownie the variable b.

Give cookies the variable c.

3b + 5c = 11.00

1b + 2c = 3.95

Multiple the entire bottom by -3 as to be able to get rid of one variable.

3b + 5c = 11.00

-3b - 6c = -11.85

Now add the top and bottom. This leaves -1c = -0.85 and then divide both sides by -1 to have the numbers become positive. So 1c = 0.85. Therefore, one cookie is $0.85.

Now we can take any of those equations and substitute c with 0.85.

1b + 2(0.85) = 3.95

1b + 1.7 = 3.95

Subtract 1.7 from 3.95 and get 2.25.

That leaves 1b = 2.25. So 1 brownie is $2.25

i just took the test, the correct answer is .. 31.5 in.

0.038

step-by-step explanation: