Which of these strategies would eliminate a variable in the system of equations? -x+6y=8
7x -y = -2

Choose all answers that apply:

(Choice A)
A Multiply the bottom equation by 6, then subtract the bottom equation from the top equation.

(Choice B)
B Add the equations.

(Choice C)
C Multiply the top equation by 7, then add the equations.

B) Subtract the bottom equation from the top equation

C) Add the equations.

Step-by-step explanation:

We have to eliminate a variable in the system of equations

6x + 5y = 1 . (1) and  

6x - 5y = 7  (2)  and,

Since the y-term on both the equations are the same but opposite in sign, therefore the strategy to eliminate y variable from the system of equations (1) and (2) is to add the equations. (Answer)

Again, the x-terms are the same and with a similar sign, therefore, by subtracting the bottom equation from the top equation we can also eliminate the x-variable. (Answer)

Step-by-step explanation:

Multiply the top equation by 7, then add the equations.

Step-by-step explanation:

I just did it Khan Academy.

i can't see the picture : /

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.