Answer:
D) 9x = 18
Explanation:
We were given the following:
[tex]\begin{gathered} y=3x-------1 \\ 3x+2y=18----2 \end{gathered}[/tex]We will proceed to use the first equation to substitute for ''y'' into the second equation, we have:
[tex]\begin{gathered} 3x+2y=18 \\ But\colon y=3x \\ \text{Substituting this into the equation, we have:} \\ 3x+2(3x)=18 \\ 3x+6x=18 \\ 9x=18 \\ \\ \therefore9x=18 \end{gathered}[/tex]Therefore, D (9x = 18) is the answer
