Question

What is the value of the y variable in the solution to the following system of equations?
2x + y = 5
x + 3y = 0

Answer 1

2x + y = 5 -(1)
x + 3y = 0 => x=-3y -(2)
Sub. (2) into (1)
2 (-3y) +y =5
y=...
Sub value of y into (2), you can get x.

Answer 2

y=10

Answer 3

2x + y= 5 - (eqn.1)
x+3y = 0 - (eqn.2)

Taking eqn.2 and multiply it by 2,
x+3y=0
2x+6y=0 - (eqn.3)

Take, eqn.3 and minus eqn.1

2x+6y- (2x+y) = 0-5
5y = -5
y=-1

Sub y=-1 to eqn.1,
2x-1 = 5
2x=6
x=3

Answer 4

Not really
2(-3y) +y =5
-6y +y =5
-5y = 5
y = ?

Answer 5

oh i get it..yeah its -1