Question

Solve the system of equations.
y=4x - 4
y=5x

Answer 1

x = -4

y = -20

Explanation:

Let's change the signs.

-y= 4 - 4x

y = 5x

ADDING UP:

0 = x + 4

x = -4

Now y is 5 times x or - 20

Answer 2

`-4 = x`

And then we can replace the value of x on equation (1) or (2) and we got:

`y = 4* (-4) -4 = -20`

And then we have our solutuon x = -4, y = -20

Explanation:

For this case we have the following system of equations:

`y = 4x-4` (1)

`y= 5x` (2)

And we can solve this system of equation using the method of elimination for example or we can set equal both equation since both are equal to y, like this:

`4x-4 = 5x`

Now w can subtract 4x from both sides and we got:

`-4 = x`

And then we can replace the value of x on equation (1) or (2) and we got:

`y = 4* (-4) -4 = -20`

And then we have our solutuon x = -4, y = -20