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

Step-by-step explanation:

Step 1:  Set the second equation into the first

Step 2:  Solve the second equation

(1,-2)

Step-by-step 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)

step-by-step explanation: