In which line is a mistake first made when solving the following system of equations by substitution? 2x - y = -4
3x + y = -9

x=(-13/5), y=(-6/5)

Step-by-step explanation:

I will do step by step since I dont see a picture.

when you add them it gets rid of the y,

5x=-13

divide out the 5

x=(-13/5)

plug this into the first equation

2(-13/5)-y=-4

-5.2-y=-4

add 5.2 to each side

-y=1.2

divide out the negative

y=-1.2 or (-6/5)

i will pick c put check it over to be sure

step-by-step explanation:

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.