Question

6. What is the value of x in the following system of equations?
x + y = -10
y = x - 2

Answer 1

X= -4

Explanation:

Hello. For to solve that, you need to use the sustitution method:

1. You need clear X in the first equation and put in the second

X+Y = -10

X = -10-Y

2. Y = X-2, then you replaced the X in this equation:

Y = (-10-Y) - 2

Y+2=-10-Y

2Y=-10-2

2Y= -12

Y= -12/2

Y=-6

3. Now you use the Y value for to solve X:

X=-10-Y, then

X =- 10-(-6)

X = -4

Answer 2

Plug in x-2 for y
x + x - 2 = -10
2x = 12, x = 6
The value of x is 6