Both of these tables represent linear graphs:

-3
8
-2
10

12
0
14
1
16
2
18
3
20
4
22
-3
-2
0
-2
0
3
4
8
10
12
Does the line through the first set of points intersect with the line through the second set of points?
(1 point)
• Yes...these lines are parallel
• Yes...these lines are perpendicular
• You cannot tell without a graph
• Yes...these lines are not parallel nor perpendicular
• No... these lines are perpendicular
• No...these lines are parallel

1 answer

To determine if the lines through the two sets of points intersect, we need to analyze their slope and y-intercept.

First Set of Points:

  • Points: (-3, 8), (-2, 10)
  • The slope (m) can be calculated using the formula \( m = \frac{y_2 - y_1}{x_2 - x_1} \).
  • Using the points: \[ m = \frac{10 - 8}{-2 + 3} = \frac{2}{1} = 2 \]
  • Now we take one point, say (-3, 8), and plug it into the slope-intercept form \( y = mx + b \) to find the y-intercept (b): \[ 8 = 2(-3) + b \] \[ 8 = -6 + b \] \[ b = 14 \]
  • The equation of the first line is \( y = 2x + 14 \).

Second Set of Points:

  • Points: (12, 0), (14, 1), (16, 2), etc.
  • Using the points (12, 0) and (14, 1): \[ m = \frac{1 - 0}{14 - 12} = \frac{1}{2} \]
  • Using the point (12, 0) to find the y-intercept: \[ 0 = \frac{1}{2}(12) + b \] \[ 0 = 6 + b \] \[ b = -6 \]
  • The equation of the second line is \( y = \frac{1}{2}x - 6 \).

Determine Intersection:

  1. Set the equations equal to find the x-coordinate of the intersection: \[ 2x + 14 = \frac{1}{2}x - 6 \]

  2. Multiply through by 2 to eliminate the fraction: \[ 4x + 28 = x - 12 \] \[ 4x - x = -12 - 28 \] \[ 3x = -40 \] \[ x = -\frac{40}{3} \]

  3. Substitute \( x = -\frac{40}{3} \) into either equation to find the y-coordinate: For the first line: \[ y = 2(-\frac{40}{3}) + 14 = -\frac{80}{3} + 14 = -\frac{80}{3} + \frac{42}{3} = -\frac{38}{3} \] So the intersection point is \((- \frac{40}{3}, - \frac{38}{3})\).

Since we determined two lines with distinct slopes (2 and \( \frac{1}{2} \)), they are not parallel. Thus, they are intersecting lines.

Therefore, the answer is:

Yes...these lines are not parallel nor perpendicular.