If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation. x + 4y = −9 2x + 5y = −6

Hence, the required equation is:

-18-3y= -6

Step-by-step explanation:

We are asked to solve a system of equation using the substitution method i.e. we need to apply:

choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation

The system of equations is given as:

x + 4y = −9 (1)

2x + 5y = −6(2)

now we find the value of x from equation (1) in terms of y:

x= -9-4y.

and put this value of x in equation (2) to obtain:

2(-9-4y)+5y= -6

-18-8y+5y= -6

-18-3y= -6

step-by-step explanation:

the first 5 right here the next 5 i will upload as separate question