What is the value of x in the equation x – y = 30, when y = 15?

The value of in the equation for is .

Further explanation:

The given equation is .

The given equation is a linear equation in two variables.

The general form of linear equation in two variables is where are real numbers such that are not equal to zero.

The equation is .

Here, the value of is .

The value of is calculated by substituting for as,

Now, simplify the above equation as shown below.

Now, add on each side of the above equation as,

The above expression can be further solved by multiplying on both side of the equation as,

Therefore, the value of in the equation for is .

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Answer details

Grade: Middle school

Subject: Mathematics

Chapter: Linear equations in two variables

Keywords: Linear equations in one variable, linear equations in two variables, function, real numbers, solution, solution set, open interval, closed intervals, semi-closed intervals, semi-open interval, values, substitute, multiply, add, subtract, divide.

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