## Lonnie2018 one year ago Determine whether the lines connecting each pair of points are parallel or perpendicular. Line 1: (-4, 3) and (5, 0) Line 2: (1, -2) and (3, 4) Its supposed to be 1/3 for both but i got 1/2 for the second line.

1. anonymous

$m=\frac{ y2-y1 }{ x2-x1 }$

2. UsukiDoll

perpendicular lines <--- there's an intersection parallel lines <---- no intersection

3. anonymous

ii'm not doing it by graphing. its an equation.

4. mathstudent55

Find the slopes again. You have them both wrong.

5. mathstudent55

Also, what you say is supposed to be, isn't correct.

6. mathstudent55

Line 1: (-4, 3) and (5, 0) $$m_1 = \dfrac{0 - 3}{5 - (-4)}$$ Line 2: (1, -2) and (3, 4) $$m_2 = \dfrac{4 - (-2)}{3 - 1}$$

7. mathstudent55

@Lonnie2018 Use my last answer and find the two slopes.

8. UsukiDoll

also parallel lines have the same slope perpendicular lines have different slopes and we use this formula $m_1 \times m_2=-1$