Alocal bake shop sells cookies and cakes. on monday , sean bought 3 cookies and 5 cakes and spent $78.75 on tuesday , sean bought 8 cookies and 2 cakes and spent $40 . find the price of one cookie and one cake .

The price of one cookie is $1.25 and the price of one cake is $15.

Step-by-step explanation:

Let $x be the price of one cookie and $y be the price of one cake.

1. On Monday, Sean bought 3 cookies and 5 cakes, then he spent $(3x+5y) and this is $78.75. Thus,

2. On Tuesday, Sean bought 8 cookies and 2 cakes, then he spent $(8x+2y) and this is $40. Thus,

3. Solve the system of two equations:

Multiply the first equation by 2 and the second equation by 5 and subtract them:

Then

the answer is d. 75%

do i do it on a graph?

step-by-step explanation: