Question

How do i solve using the substitution method?
x+y=-1
y=-2x

Answer 1

(1,-2)

Explanation:

x+y=-1

y=-2x

substitute the value of y into an equation

x-2x=-1

minus the x and -2x

-1x=-1

divide both sides by -1

x=1

substitute the value of x into an equation

y=-2*1

multiply -2 and 1

y= -2

(1, -2)

Answer 2

`(1, -2)`

Explanation:

Step 1: Set the second equation into the first

`x + (-2x) = -1`

`x - 2x = -1`

`-x / -1 = -1 / -1`

`x = 1`

Step 2: Solve the second equation

`y = -2(1)`

`y = -2`

Answer:
`(1, -2)`