## PrincessInsainty Help me with my math! 1. What is the slope of the line that passes through the points (–2, 5) and (1, 4)? (1 point) –3 –2 -1/3 1/3 2. A line has slope -5/3. Through which two points could this line pass? (1 point) (12, 13), (17, 10) (16, 15), (13, 10) (0, 7), (3, 10) (11, 13), (8, 18) 3. The pair of points (6, y) and (10, –1) lie on a line with slope 1/4 . What is the value of y? (1 point) –5 –2 2 5 4. What is the slope of a vertical line? (1 point) –1 0 1 undefined 2 years ago 2 years ago

1. myininaya

$\text{ slope of line given two points}=m=\frac{\Delta y}{\Delta x}=\frac{y_1-y_2}{x_1-x_2}$ the points are $(x_1,y_1) \text{ and } (x_2,y_2)$

2. slaaibak

1. -1/3 2. (11, 13), (8, 18) 3. -2 4. undefined

3. davidmckenna

Hey slaaibak I understand pretty much what you said but for the first one I didn't get -1/3 I got 1/3? Following myininaya's rule m =$\Delta y \div \Delta x$, the answer should be $1\div3$ = 1/3?

4. myininaya

$\frac{5-4}{-2-1}=\frac{1}{-3}$

5. slaaibak

(–2, 5) and (1, 4) (4-5)/(1-(-2)) = -1 / 3

6. PrincessInsainty

thank you guys, without you guys i wouldn't know what do while my tutor was out of town

7. slaaibak

PI, if you need us to explain and you don't understand a few of the stuff, i'd be happy to explain it to you

8. PrincessInsainty

ok

9. davidmckenna

Right so (-2, 5) (1, 4) Between -2 and 1 there is 3 and between 5 and 4 there is 1. 1/3? What am I not seeing here??

10. slaaibak

If you look at the coordinates, while the x is increasing, the y decreases. the absolute value of the slope is 1/3, but because of the inverse relationship, it's a negative slope, since x-decreases and y decreases, therefore -1/3

11. davidmckenna

Okay I think I get it now ty