SephI 3 years ago Solve graphing.

1. SephI

$y = - \frac{ 3 }{ 2}x + 4$ How would I solve that? How would I do the Rise over Run when my fraction is negative?

2. SephI

@DarienCollup @Solmyr @Faman39 @KatherinePierce1864 @AlexPR787 @dennisjr

3. SephI

@lovekblue

4. Hero

Graph the first three points, then draw a line through them

5. SephI

HOw would I graph the fraction part?

6. Hero

You're focusing too much on the "fraction part". What you will be graphing are points on a line.

7. Hero

Remember, you still have y = mx + b, which is the formula for a line. The fraction part only represents the slope of the line.

8. SephI

Huh? What do you mean?

9. SephI

My school is telling me that I would graph (0, 4) and then graph the fraction with rise over run, but the fraction is negative and I don't know how to work with it.

10. Hero

Just focus on graphing the points.

11. Hero

Focus on the x and y intercepts

12. SephI

I don't understand.

13. SephI

Wouldn't I graph 4?

14. Hero

You found one of the points: (0,4)

15. Hero

Now find the x-intercept. Set y = 0, then solve for x

16. SephI

Uhhh..

17. Hero

Do you have any clue what's going on here?

18. SephI

I'm left with a fraction still. I don't know how to graph that fraction. I know it would be an rise over run process, but the fraction is negative. That changes it for me.

19. JayDS

What you need to graph is a straight line and the most important parts relating to it such as the x and y intercepts if they are any, in this case there are both.

20. SephI

What happens when the fraction is negative? Does it change? Would I make the 3 negative? Would both the numbers be negative?

21. SephI

I'm not graphing both the intercepts. It says graph the y-intercept first, and graph the slope, which is the fraction?

22. JayDS

just the 3 is negative.

23. JayDS

When you graph the two intercepts and connect them, it will automatically contain the slope/gradient of the line.

24. SephI

so (-3, 2)

25. Hero

$y = - \frac{ 3 }{ 2}x + 4$ $0 = - \frac{ 3 }{ 2}x + 4$ $\frac{ 3 }{ 2}x = 4$ $\frac{ 3x }{ 2} = 4$ $3x = 8$ $x = \frac{8}{3}$ $x = 2\frac{2}{3}$

26. JayDS

Slope/gradient is found by $M = \frac{y2-y1}{x2-x1}$ or rise/run your rise is -3 and run is 2

27. Hero

So the other point is $(2.67, 0)$

28. SephI

I think it just wants one answer .-.

29. SephI

This is basic 9th grade math.

30. Hero

No, you need at least two points to graph a line. You can't graph a line with only one point.

31. Hero

Didn't your teacher go over this with you?

32. SephI

I mean, I think they want me to find the rise over run by graphing (-3, 2) and 4.

33. Hero

You already have the rise over run

34. Hero

-3/4 is the rise over run

35. SephI

So: $-\frac{ 3 }{ 2 } = \frac{ -3 }{ 2 }$ Is this correct? When dealing with a negative fraction in rise over run, the top number becomes negative when putting it into an ordered pair?

36. SephI

?

37. Hero