Question

To solve the system of equations below, Maria isolated the variable y in the first equation and then substituted it into the second equation. What was the resulting equation?
{ 3y=12x
{x^2+y=18

A. x^2 + x = 18
B. x^2 − 4x = 18
C. x^2 + 4 = 18
D. x^2 + 4x = 18

Answer 1

Answer:

D. $x^2 + 4x = 18$

Step-by-step explanation:

To solve the system of equations below, Maria isolated the variable y in the first equation and then substituted it into the second equation.

First equation is $3y=12x$

To isolate y we divide both sides by 3

$y=4x$

Now substitute 4x for y in second equation

$x^2+y=18$

$x^2+4x=18$

this equation is in option D

Answer 2

Y = 4x
The answer is D