Linear Algebra Examples

$x + 2 y = 4$

Step 1

Subtract $x$ from both sides of the equation.

$2 y = 4 - x$

Step 2

Divide each term in $2 y = 4 - x$ by $2$ and simplify.

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Step 2.1

Divide each term in $2 y = 4 - x$ by $2$ .

$\frac{2 y}{2} = \frac{4}{2} + \frac{- x}{2}$

Step 2.2

Simplify the left side.

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Step 2.2.1

Cancel the common factor of $2$ .

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Step 2.2.1.1

Cancel the common factor.

$\frac{2 y}{2} = \frac{4}{2} + \frac{- x}{2}$

Step 2.2.1.2

Divide $y$ by $1$ .

$y = \frac{4}{2} + \frac{- x}{2}$

Step 2.3

Simplify the right side.

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Step 2.3.1

Simplify each term.

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Step 2.3.1.1

Divide $4$ by $2$ .

$y = 2 + \frac{- x}{2}$

Step 2.3.1.2

Move the negative in front of the fraction.

$y = 2 - \frac{x}{2}$

Step 3

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Interval Notation:

$(- \infty, \infty)$

Set-Builder Notation:

${x | x \in ℝ}$

Step 4