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.
Find the values of m and b using the form y=mx+b.
The slope of the line is the value of m, and the y-intercept is the value of b.
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.
Simplify the result.
Multiply -10 by 3.
Add -30 and 50.
The final answer is 20.
The y value at x=3 is 20.
Create a table of the x and y values.
Graph the line using the slope and the y-intercept, or the points.