## Section 7.7 Additional Practice Related to Lines

¶### Exercises Exercises

Questions vary.

###### 1.

Complete the entries in Figure 7.7.1 for the line with equation \(2x-5y=10\text{.}\) Also, state the \(x\) and \(y\) intercepts of the line.

\(x\) | \(y\) |

\(-10\) | |

\(-5\) | |

\(0\) | |

\(5\) | |

\(10\) |

The \(x\)-intercept is \((5,0)\) and the \(y\)-intercept is \((0,-2)\text{.}\)

\(x\) | \(y\) |

\(-10\) | \(-6\) |

\(-5\) | \(-4\) |

\(0\) | \(-2\) |

\(5\) | \(0\) |

\(10\) | \(2\) |

###### 2.

Complete the entries in Figure 7.7.3 for the line with equation \(-x-7y=3\text{.}\) Also, state the \(x\) and \(y\) intercepts of the line.

\(x\) | \(y\) |

\(2\) | |

\(-3\) | |

\(-2\) | |

\(\frac{2}{7}\) | |

\(-\frac{5}{14}\) |

The \(x\)-intercept is \((-3,0)\) and the \(y\)-intercept is \(\left(0,-\frac{3}{7}\right)\text{.}\)

\(x\) | \(y\) |

\(2\) | \(-\frac{5}{7}\) |

\(-24\) | \(-3\) |

\(-2\) | \(-\frac{1}{7}\) |

\(-5\) | \(\frac{2}{7}\) |

\(-\frac{1}{2}\) | \(-\frac{5}{14}\) |

###### 3.

Determine the slope of the line that passes through the points \((2,-2)\) and \((-4,16)\text{.}\)

The slope is \(-3\text{.}\)

###### 4.

Determine the slope of the line that passes through the points \((6,2)\) and \((-6,-8)\text{.}\)

The slope is \(\frac{5}{6}\text{.}\)

###### 5.

Determine the slope of the line shown in Figure 7.7.5.

The slope is \(-\frac{2}{3}\text{.}\)

###### 6.

A line with a slope of \(\frac{4}{5}\) passes through the point \((-4,-7)\text{.}\) What is the \(y\)-coordinate of the point on this line that has an \(x\)-coordinate of \(6\text{?}\)

The \(y\)-coordinate is \(1\text{.}\)

###### 7.

A line with a slope of \(-3\) passes through the point \((4,-14)\text{.}\) What is the \(y\)-coordinate of the point that has an \(x\)-coordinate of \(-3\text{?}\)

The \(y\)-coordinate is \(7\text{.}\)

###### 8.

A line with a slope of \(-\frac{1}{2}\) passes through the point \((410,27)\text{.}\) What is the \(x\)-coordinate of the point that a \(y\)-coordinate of \(24\text{?}\)

The \(x\)-coordinate is \(416\text{.}\)

Use the slope-intercept form of the equation of a line to determine the equation of each described line.

###### 9.

Determine the equation of the line that has a slope of \(\frac{11}{8}\) and a \(y\)-intercept of \((0,-4)\text{.}\) Write the equation in slope-intercept form.

The equation is \(y=\frac{11}{8}x-4\)

###### 10.

Determine the equation of the line that has a slope of \(-\frac{1}{3}\) and an \(x\)-intercept of \((6,0)\text{.}\) Write the equation in slope-intercept form.

The equation is \(y=-\frac{1}{3}x+2\text{.}\)

###### 11.

Determine the equation of the line that passes through the points \((1,12)\) and \((-3,-8)\text{.}\) Write the equation in slope-intercept form.

The equation is \(y=5x+7\text{.}\)

###### 12.

Determine the equation of the line shown in Figure 7.7.6. Write the equation in slope-intercept form.

The equation is \(y=\frac{5}{2}x-1\text{.}\)

Use the point-slope form of the equation of a line to determine the equation of the line that passes through each pair of points. State your final answer in slope-intercept form.

###### 13.

\((9,-2)\) and \((7,-8)\)

The equation of the line is \(y=3x-29\text{.}\)

###### 14.

\((-3,5)\) and \((5,1)\)

The equation of the line is \(y=-\frac{1}{2}x+\frac{7}{2}\text{.}\)

###### 15.

\((-11,0)\) and \((-9,2)\)

The equation of the line is \(y=x+11\text{.}\)

###### 16.

\((0,7)\) and \((-3,10)\)

The equation of the line is \(y=-x+7\text{.}\)

Questions vary.

###### 17.

What are the equations of the vertical and horizontal lines that pass through the point \((9,2)\text{?}\)

The vertical line's equation is \(x=9\) and the horizontal line's equation is \(y=2\text{.}\)

###### 18.

What is the slope of any line that is parallel to the line with equation \(6x-10y=7\text{?}\)

The slope is \(\frac{3}{5}\text{.}\)

###### 19.

What is the slope of any line that is perpendicular to the line with equation \(y=-\frac{1}{8}x+11\text{?}\)

The slope is \(8\text{.}\)