Solve by Substitution y=1/x , x+y=2

$y = \frac{1}{x}$ , $x + y = 2$

Step 1

Replace all occurrences of $y$ with $\frac{1}{x}$ in each equation.

Replace all occurrences of $y$ in $x + y = 2$ with $\frac{1}{x}$ .

$x + \frac{1}{x} = 2$

$y = \frac{1}{x}$

Simplify the left side.

Remove parentheses.

$x + \frac{1}{x} = 2$

$y = \frac{1}{x}$

$x + \frac{1}{x} = 2$

$y = \frac{1}{x}$

$x + \frac{1}{x} = 2$

$y = \frac{1}{x}$

Step 2

Solve for $x$ in $x + \frac{1}{x} = 2$ .

Find the LCD of the terms in the equation.

Finding the LCD of a list of values is the same as finding the LCM of the denominators of those values.

$1, x, 1$

$y = \frac{1}{x}$

The LCM of one and any expression is the expression.

$y = \frac{1}{x}$

Multiply each term in $x + \frac{1}{x} = 2$ by $x$ to eliminate the fractions.

Multiply each term in $x + \frac{1}{x} = 2$ by $x$ .

$x \cdot x + \frac{1}{x} \cdot x = 2 x$

$y = \frac{1}{x}$

Simplify the left side.

Simplify each term.

Multiply $x$ by $x$ .

$x^{2} + \frac{1}{x} \cdot x = 2 x$

$y = \frac{1}{x}$

Cancel the common factor of $x$ .

Cancel the common factor.

$x^{2} + \frac{1}{x} \cdot x = 2 x$

$y = \frac{1}{x}$

Rewrite the expression.

$x^{2} + 1 = 2 x$

$y = \frac{1}{x}$

$x^{2} + 1 = 2 x$

$y = \frac{1}{x}$

$x^{2} + 1 = 2 x$

$y = \frac{1}{x}$

$x^{2} + 1 = 2 x$

$y = \frac{1}{x}$

$x^{2} + 1 = 2 x$

$y = \frac{1}{x}$

Solve the equation.

Subtract $2 x$ from both sides of the equation.

$x^{2} + 1 - 2 x = 0$

$y = \frac{1}{x}$

Factor using the perfect square rule.

Rearrange terms.

$x^{2} - 2 x + 1 = 0$

$y = \frac{1}{x}$

Rewrite $1$ as $1^{2}$ .

$x^{2} - 2 x + 1^{2} = 0$

$y = \frac{1}{x}$

Check that the middle term is two times the product of the numbers being squared in the first term and third term.

$2 x = 2 \cdot x \cdot 1$

$y = \frac{1}{x}$

Rewrite the polynomial.

$x^{2} - 2 \cdot x \cdot 1 + 1^{2} = 0$

$y = \frac{1}{x}$

Factor using the perfect square trinomial rule $a^{2} - 2 a b + b^{2} = {(a - b)}^{2}$ , where $a = x$ and $b = 1$ .

${(x - 1)}^{2} = 0$

$y = \frac{1}{x}$

${(x - 1)}^{2} = 0$

$y = \frac{1}{x}$

Set the $x - 1$ equal to $0$ .

$x - 1 = 0$

$y = \frac{1}{x}$

Add $1$ to both sides of the equation.

$x = 1$

$y = \frac{1}{x}$

$x = 1$

$y = \frac{1}{x}$

$x = 1$

$y = \frac{1}{x}$

Step 3

Replace all occurrences of $x$ with $1$ in each equation.

Replace all occurrences of $x$ in $y = \frac{1}{x}$ with $1$ .

$y = \frac{1}{1}$

$x = 1$

Simplify the right side.

Divide $1$ by $1$ .

$y = 1$

$x = 1$

$y = 1$

$x = 1$

$y = 1$

$x = 1$

Step 4

The solution to the system is the complete set of ordered pairs that are valid solutions.

$(1, 1)$

Step 5

The result can be shown in multiple forms.

Point Form:

$(1, 1)$

Equation Form:

$x = 1, y = 1$

Step 6

Solve by Substitution y=1/x , x+y=2

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