Y=x−1 2x+y=8
If you were to solve the following system using substitution, your new equation would be...

2x+ (x-1) = 8

Simplified

3x-1 =8

Step-by-step explanation:

y=x−1

2x+y=8

Take the first equation and everywhere you see y in the second equation substitute x-1

2x+ (x-1) = 8

You can simplify

2x+x-1 =8

3x-1 =8

If you want to solve

3x-1+1 =8+1

3x= 9

Divide by 3

3x/3 =9/3

x=1

Then solve for y

y = x-1

y = 3-1

y=2

to plot points   for x just start at the origin (middle) and go to the left however many times it say(if the number is a positive) if the number is a negative then go right however many times it says if it is 0 go nowhere

now keep you pencil there and go up however many times it says on y(if it is positive) if it is negative then go down however many times it says. if it says 0 go nowhere.

you have just plotted a point! now when you finish plotting all of them connect them with a ruler

plot each point as (-3, 7), (0,4), (3,1), (8,-4)   in the parenthesis on the left of the comma is x and the right is y.