Question
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Find the equation of the line using the point-slope formula. Passes through the point \( (-7,8) \) and is parallel to the graph \( y=\frac{6}{7} x+4 \). ?

Ask by Pollard Cross. in the United States
Mar 10,2025

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Tutor-Verified Answer

Answer

The equation of the line is \( y = \frac{6}{7}x + 14 \).

Solution

Using the point-slope form \( y - y_1 = m(x-x_1) \), where \( m \) is the slope and \( (x_1,y_1) \) is the given point: 1. The given line is \( y=\frac{6}{7} x+4 \), so its slope is \[ m=\frac{6}{7}. \] 2. The line passes through the point \( (-7,8) \), so \( x_1=-7 \) and \( y_1=8 \). 3. Substitute these values into the point-slope form: \[ y-8=\frac{6}{7}(x-(-7))=\frac{6}{7}(x+7). \] 4. Solve for \( y \) by adding \( 8 \) to both sides: \[ y=\frac{6}{7}(x+7)+8. \] 5. Distribute \( \frac{6}{7} \): \[ y=\frac{6}{7}x+\frac{6}{7}\cdot7+8. \] 6. Simplify: \[ \frac{6}{7}\cdot7=6, \] so, \[ y=\frac{6}{7}x+6+8. \] 7. Combine the constants: \[ y=\frac{6}{7}x+14. \] Thus, the equation of the line is \[ y=\frac{6}{7}x+14. \]

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Bonus Knowledge

To find the equation of the line, we first identify the slope of the line we want to be parallel to. The slope of the line given by \( y = \frac{6}{7}x + 4 \) is \( \frac{6}{7} \). Since parallel lines have the same slope, the slope of our desired line is also \( \frac{6}{7} \). Using the point-slope formula, which is \( y - y_1 = m(x - x_1) \), where \( m \) is the slope and \( (x_1, y_1) \) is the point the line passes through, we can substitute in our values. Here, \( m = \frac{6}{7} \), \( x_1 = -7 \), and \( y_1 = 8 \): \[ y - 8 = \frac{6}{7}(x - (-7)) \] \[ y - 8 = \frac{6}{7}(x + 7) \] This gives us the equation of the line in point-slope form. To convert it into slope-intercept form, you can simplify: \[ y - 8 = \frac{6}{7}x + 6 \] \[ y = \frac{6}{7}x + 14 \] So, the equation of the line is \( y = \frac{6}{7}x + 14 \).

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