Question

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

Answer 1

Answer:

(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)

Answer 2

Answer:

$(1, -2)$

Step-by-step 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:  $(1, -2)$