Variable Calculator

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Variable calculator is used to find the values for variables in linear equations. We know variables are the alphabets which having a constant value. In a 2 linear system of equation we have two variables. If we have two equations we can find the values for two variables.


 Example 1: Find the value for the variable x in the equation 7x + 7 = 5x + 9

The given equation is 7x + 7 = 5x + 9

We can add -7 on both sides of the above equation

Now we can write 7x + 7 – 7 = 5x + 9 – 7

We have the equation 7x = 5x + 2, next we can add – 5x on both sides

7x – 5x = 5x + 2 – 5x

Therefore, 2x = 2 => x = 1 


Example 2: Find the values for variables x and y.

2x + y =2 and x + y = 2.

We have 2 linear equation 2x + y =2 and x + y = 2

From the first equation we can write y = 2 – 2x, now we can plug in the second equation

Therefore, x + 2 – 2x = 2

Now we can simplify this as, -x = 0 => x = 0

Then we can plug this x value in the first or second equation

x + y = 2 => 0 + y = 2 => y = 2



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