Math Problem Statement

Use the given conditions to write an equation for the line in point-slope form and in slope-intercept form. Passing through (-9, -4) and parallel to the line whose equation is y = -4x + 2. Write an equation for the line in point-slope form.

Solution

To solve this problem, let's first go step by step:

Step 1: Identify the slope of the line

The equation of the line given is y=4x+2y = -4x + 2. This is in slope-intercept form: y=mx+by = mx + b where:

  • mm is the slope,
  • bb is the y-intercept.

From the equation y=4x+2y = -4x + 2, the slope m=4m = -4.

Since the new line is parallel to this line, it will have the same slope. Therefore, the slope of the new line is also 4-4.

Step 2: Write the equation in point-slope form

The point-slope form of a line is given by: yy1=m(xx1)y - y_1 = m(x - x_1) where:

  • (x1,y1)(x_1, y_1) is a point on the line, and
  • mm is the slope.

The problem states that the new line passes through (9,4)(-9, -4), so x1=9x_1 = -9 and y1=4y_1 = -4. Using the slope m=4m = -4, the equation in point-slope form becomes: y(4)=4(x(9))y - (-4) = -4(x - (-9)) Simplifying: y+4=4(x+9)y + 4 = -4(x + 9)

Step 3: Simplify the equation to slope-intercept form

Now, distribute the slope 4-4 on the right-hand side: y+4=4x36y + 4 = -4x - 36 Subtract 4 from both sides to isolate yy: y=4x40y = -4x - 40

Final Answer:

  • The equation in point-slope form is: y+4=4(x+9)y + 4 = -4(x + 9)
  • The equation in slope-intercept form is: y=4x40y = -4x - 40

Would you like any more details or clarifications?

Here are 5 related questions you can explore:

  1. How would the equation change if the line passed through a different point?
  2. What happens to the slope if the lines are perpendicular instead of parallel?
  3. How do you convert from point-slope form to standard form?
  4. How can you find the equation of a line given two points instead of a slope?
  5. How does the graph of the line change when the slope increases or decreases?

Tip: Always check the slope when dealing with parallel or perpendicular lines; parallel lines share the same slope, while perpendicular lines have slopes that are negative reciprocals of each other.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slopes
Point-Slope Form
Slope-Intercept Form

Formulas

Point-slope form: y - y₁ = m(x - x₁)
Slope-intercept form: y = mx + b

Theorems

Parallel lines have equal slopes

Suitable Grade Level

Grades 9-10