Question

Suppose C= 25y + 10 and y = 30x + 15.Which of the following is equivalent to C= 25y + 10, but written only interms of x?a.) C = 75x +45b.) C = 750x + 375c.) C = 75x+385d.) C = 750x + 385!!!1.:The Sexpres

Answer 1

Given the question in the image, the following are the solution steps to answer the question.

STEP 1: Write the given equations

`\begin{gathered} C=25y+10-----equation\text{ 1} \\ y=30x+15----equation\text{ 2} \end{gathered}`

STEP 2: Substitute 30x+15 for y in equation 1

`\begin{gathered} C=25(30x+15)+10 \\ C=750x+375+10 \\ C=750x+385 \end{gathered}`

Hence, the answer is:

`C=750x+385`