System of equation using substitution?///?

1) start with

y = 2x - 4

2) It specifically says that y equals x - 1

So sub in x - 1 in the place of y

After you replace y with its perfect equal x - 1, you get:

x - 1 = 2x - 4

3) Subtract x from both sides to get all the x terms on the same side together

Once you subtract, you will get this:

- 1 = x - 4

4) Add 4 to both sides to isolate x

After you add, you end up with this:

3 = x <-- answer

y=x-1

y=2x-4

since y = y then

y=x-1=2x-4, so

x-1=2x-4

subtract x from both sides to get x's on one side

x-x-1 = 2x-x-4

-1 = x - 4

now add 4 to both sides to get rid of the 4

4-1 = x-4+4

3 = x

if x is 3 then y = 2 if you plug into any of the given equations

x - 1 = 2x - 4

x = 3, y = 2