Question

Given the system of equations, what is the solution?

2x + y = -1
x - y = -5

Answer 1

You need to change one of the equation into slope-intercept form.

Let's change the second one.

\(\large\bf{x-y=-5}\)

You would `subtract x` from both sides.

\(\bf{x\color{red}{-x}-y=-5\color{red}{-x}}\)

\(\bf{-y=-x-5}\)

Now rid of the negative.

\(\large\bf{y=x+5}\)

~~~

Now you would apply the equation into the first equation.

\(\large\bf{2x+(x+5)=-1}\)

How would you simplify this?