Question

What is the resulting equation?2y = 6xX² + y = 28

Answer 1

C. x^2 + 3x = 28

EXPLANATION :

From the problem, we have :

`\begin{cases}2y=6x{} \\ x^2+y=28{}\end{cases}`

Express the first equation as y in terms of x :

`\begin{gathered} 2y=6x \\ y=(6x)/(2) \\ \\ y=3x \end{gathered}`

Then substitute y = 3x to the second equation.

`\begin{gathered} x^2+y=28 \\ x^2+3x=28 \end{gathered}`