Solve by Graphing x+y=9 , x-y=7

$x + y = 9$ , $x - y = 7$

Subtract $x$ from both sides of the equation.

$y = 9 - x$

$x - y = 7$

Subtract $x$ from both sides of the equation.

$y = 9 - x$

$- y = 7 - x$

Multiply each term in $- y = 7 - x$ by $- 1$

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Multiply each term in $- y = 7 - x$ by $- 1$ .

$y = 9 - x$

$(- y) \cdot - 1 = 7 \cdot - 1 + (- x) \cdot - 1$

Multiply $(- y) \cdot - 1$ .

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Multiply $- 1$ by $- 1$ .

$y = 9 - x$

$1 y = 7 \cdot - 1 + (- x) \cdot - 1$

Multiply $y$ by $1$ .

$y = 9 - x$

$y = 7 \cdot - 1 + (- x) \cdot - 1$

$y = 9 - x$

$y = 7 \cdot - 1 + (- x) \cdot - 1$

Simplify each term.

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Multiply $7$ by $- 1$ .

$y = 9 - x$

$y = - 7 + (- x) \cdot - 1$

Multiply $(- x) \cdot - 1$ .

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Multiply $- 1$ by $- 1$ .

$y = 9 - x$

$y = - 7 + 1 x$

Multiply $x$ by $1$ .

$y = 9 - x$

$y = - 7 + x$

$y = 9 - x$

$y = - 7 + x$

$y = 9 - x$

$y = - 7 + x$

$y = 9 - x$

$y = - 7 + x$

Create a graph to locate the intersection of the equations. The intersection of the system of equations is the solution.

$(8, 1)$

Solve by Graphing x+y=9 , x-y=7

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