Question

what is the solution to the system of equations y=2x+5 y+3x=0

Answer 1

\(\large\color{black}{ \displaystyle y=2x+5 }\)
\(\large\color{black}{ \displaystyle y+3x=0 }\)

You can do a "substitution". What does the first equation tell you? It tells you that 'y' is the same thing as '2x+5', so you can substitute '2x+5' instead of y, into the other (the second) equation,

Answer 2

and you get:
\(\large\color{black}{ \displaystyle \color{blue}{2x+5}+3x=0 }\)

Answer 3

from here, can you solve for \(\large\color{black}{ \displaystyle x}\) in this equation ?