# Graph x+y-9=0 x+y-9=0
Move all terms not containing y to the right side of the equation.
Subtract x from both sides of the equation.
y-9=-x
Add 9 to both sides of the equation.
y=-x+9
y=-x+9
Use the slope-intercept form to find the slope and y-intercept.
The slope-intercept form is y=mx+b, where m is the slope and b is the y-intercept.
y=mx+b
Find the values of m and b using the form y=mx+b.
m=-1
b=9
The slope of the line is the value of m, and the y-intercept is the value of b.
Slope: -1
y-intercept: 9
Slope: -1
y-intercept: 9
Any line can be graphed using two points. Select two x values, and plug them into the equation to find the corresponding y values.
Choose 3 to substitute in for x to find the ordered pair.
Replace the variable x with 3 in the expression.
f(3)=-(3)+9
Simplify the result.
Multiply -1 by 3.
f(3)=-3+9
f(3)=6
6
6
The y value at x=3 is 6.
y=6
y=6
Choose 2 to substitute in for x to find the ordered pair.
Replace the variable x with 2 in the expression.
f(2)=-(2)+9
Simplify the result.
Multiply -1 by 2.
f(2)=-2+9
f(2)=7
7
7
The y value at x=2 is 7.
y=7
y=7
Create a table of the x and y values.
xy2736
xy2736
Graph the line using the slope and the y-intercept, or the points.
Slope: -1
y-intercept: 9
xy2736
Graph x+y-9=0     