Answer :

mhanifa

Answer:

  • Variable x in first equation

Step-by-step explanation:

Given system

  • x = 5y - 1
  • x + 2y = 13

Variables in this system are x and y.

Isolating a variable means rearranging the equation so that a variable of our interest is on its own in one side of the equal sign.

We see variable x is isolated in the first equation.

In the second equation both of the variables are on the same side so they are not isolated.

MisterBrainly

Answer:

x

Step-by-step explanation:

  • x=5y-1--(1)

The x variable is isolated here as it's solo on left side

Solve the equations

  • x+2y=13
  • x=-2y+13--(2)

Equate

  • 5y-1=-2y+13
  • 7y=14
  • y=2

x=10-1=9

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