Solve by Substitution x+y=3 y=8

$x + y = 3$ $y = 8$

Step 1

Replace all occurrences of $y$ with $8$ in each equation.

Replace all occurrences of $y$ in $x + y = 3$ with $8$ .

$x + 8 = 3$

$y = 8$

Simplify the left side.

Remove parentheses.

$x + 8 = 3$

$y = 8$

$x + 8 = 3$

$y = 8$

$x + 8 = 3$

$y = 8$

Step 2

Move all terms not containing $x$ to the right side of the equation.

Subtract $8$ from both sides of the equation.

$x = 3 - 8$

$y = 8$

Subtract $8$ from $3$ .

$x = - 5$

$y = 8$

$x = - 5$

$y = 8$

Step 3

Solve the system of equations $x = - 5 y = 8$ .

$x = - 5 y = 8$

Step 4

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

$(- 5, 8)$

Step 5

The result can be shown in multiple forms.

Point Form:

$(- 5, 8)$

Equation Form:

$x = - 5, y = 8$

Step 6