Solve by substitution: y = 3x + 4 and y = -2x – 1.

Question

asked Oct 12, 2023 234k views

1 Answer

Slevin · Answer 1 · 2023-10-18T02:32:20+0000

we have two equation and two variables:

$\begin{gathered} y=3x+4 \\ y=-2x-1 \end{gathered}$

Now we can substitude the first equation into the second equation:

Now we move all the terms with an x to the left and the constants to the right

and we simplify

$\begin{gathered} 5x=-5 \\ x=-(5)/(5) \\ x=-1 \end{gathered}$

Now with the value of x, we can substitude into any equation, I am going to use the first one:

$\begin{gathered} y=3x+4 \\ y=3(-1)+4 \\ y=-3+4 \\ y=1 \end{gathered}$