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# Writing Equations Of Lines

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Are you sure you want to
• write an equation of a line whose slope is m=-3 and whose y-intercept is b=7
Are you sure you want to
• write an equation of a line whose slope is m=-3 and whose y-intercept is b=7
Are you sure you want to

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• 1. Writing Equations of Lines
• 2. Do Now: Answer each of the following questions based on the graph
• What is the slope of the line?
• What is the y-intercept?
• 3. What is the equation of the line?
• 3. How do we write equations of lines?
• Determine the slope
• Determine the y-intercept
• Sub slope ( m ) and y-intercept ( b ) into
• y = mx + b
• 4. Practice:
• What is the slope of the line?
• What is the y-intercept?
• 3. What is the equation of the line?
• 5. Practice:
• What is the slope of the line?
• What is the y-intercept?
• 3. What is the equation of the line?
• 6. How do we write equations of lines without the graph?
• 1. Example: Write an equation of the line whose slope is 3 and passes through the point (1,4).
• What is slope (m ) ?
• To find y-intercept:
• a. Sub m, x and y into y=mx +b
• b. Solve for b
• 3. Sub m and b into y=mx +b
• 7. Practice
• 2 . Example: Write an equation of the line whose slope is - 2 and passes through the point (2,-3).
• What is slope (m ) ?
• To find y-intercept:
• a. Sub m, x and y into y=mx +b
• b. Solve for b
• 3. Sub m and b into y=mx +b
• 8. How do we write equations of lines without the graph?
• 3. Example: Write an equation of the line that passes through the points (2,6) and (-2,10).
• Find slope (m ) using slope formula
• To find y-intercept, pick one of the points given:
• a. Sub m, x and y into y=mx +b
• b. Solve for b
• 3. Sub m and b into y=mx +b
• 9. Practice:
• 4. Example: Write an equation of the line that passes through the points (-1,-2) and (2,10).
• Find slope (m ) using slope formula
• To find y-intercept, pick one of the points given:
• a. Sub m, x and y into y=mx +b
• b. Solve for b
• 3. Sub m and b into y=mx +b
• 10. How do we write equations of lines without the graph?
• 5. Write the equation of a line whose slope is - 3 and
• y-intercept is 1.
• Find slope ( m )
• Find y-intercept ( b )
• Substitute into y=mx+b
• 11. Practice
• 6 . Write the equation of a line whose slope is 1/2 and
• y-intercept is -3.
• Find slope ( m )
• Find y-intercept ( b )
• Substitute into y=mx+b
• 12. Practice
• 7. What is the equation of the line that is parallel to y - 2x = 4 and whose y-intercept is –1?
• Find slope ( m )
• Find y-intercept ( b )
• Substitute into y=mx+b
• 13. Practice
• 8. What is the equation of the line that is parallel to y + 3x = 2 and whose y-intercept is 4?
• Find slope ( m )
• Find y-intercept ( b )
• Substitute into y=mx+b
• 14. Practice
• 9. Write an equation of the line that is perpendicular to
• y = 2x + 4 and whose
• y-intercept is 2?
• Find slope ( m )
• Find y-intercept ( b )
• Substitute into y=mx+b
• 15. Practice
• 10.Write an equation of the line that is perpendicular to
• y = ½ x - 2 and whose
• y-intercept is 1?
• Find slope ( m )
• Find y-intercept ( b )
• Substitute into y=mx+b