Question

Question 5 of 25 y= 3x, 3x + 2y = 18 Which of these shows the result of using the 1st equation to substitute for Y in the 2nd equation then combining like terms Then there's multiple choice a is 6X = 18, B is 3X=18, C 3y = 18, D 9X = 18

Answer 1

Answer:

D) 9x = 18

Explanation:

We were given the following:

$\begin{gathered} y=3x-------1 \\ 3x+2y=18----2 \end{gathered}$

We will proceed to use the first equation to substitute for ''y'' into the second equation, we have:

$\begin{gathered} 3x+2y=18 \\ But\colon y=3x \\ \text{Substituting this into the equation, we have:} \\ 3x+2(3x)=18 \\ 3x+6x=18 \\ 9x=18 \\ \\ \therefore9x=18 \end{gathered}$

Therefore, D (9x = 18) is the answer