## PrincessInsainty Group Title 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 Group Title

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

2. slaaibak Group Title

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

3. davidmckenna Group Title

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 Group Title

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

5. slaaibak Group Title

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

6. PrincessInsainty Group Title

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

7. slaaibak Group Title

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 Group Title

ok

9. davidmckenna Group Title

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 Group Title

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 Group Title

Okay I think I get it now ty