Writing Equations Of Lines
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Writing Equations Of Lines - Presentation Transcript
- Writing Equations of Lines
- 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?
- 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
- Practice:
- What is the slope of the line?
- What is the y-intercept?
- 3. What is the equation of the line?
- Practice:
- What is the slope of the line?
- What is the y-intercept?
- 3. What is the equation of the line?
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
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