1. This is a function table and I need to find the rule (-5, -7) (-3 , -10) (-1, -13) Please help me find the function 2. What is the largest river in the world? Please help!
2006-12-13 11:23:58 · 4 answers · asked by Morie Jay 2 in Education & Reference ➔ Homework Help
1) Look at the differences:
(-5, -7) and (-3, -10)
Going from -5 to -3 means add 2. Going from -7 to -10 means subtract 3.
(-3, -10) and (-1, -13)
Going from -3 to -1 means add 2. Going from -10 to -13 means subtract 3.
It's the same in both cases, so that means when you add 2 to the x, you subtract 3 from the y.
Now: what you report as the "rule" depends on what your teacher wants. What I have written there is a way of doing it. Another way would be to report the slope - the rise over the run - as -3/2. A third way would be to develop an equation that gives y as a function of x. Since we know the slope, we know it'll be of the form
y = (-3/2) x + b
To find b, we pick one point and plug it in:
-7 = (-3/2)(-5) + b
-7 = 15/2 + b
b = -7 - 15/2 = -29/2
So the equation would be
y = (-3/2)x - 29/2
which you can check to see that it gives you the other two points. So - pick the one your teacher wants. If it's the last, be aware that he/she may want you to reduce the 29/2.
2) How is this a math question? Just Google it.
2006-12-13 11:32:04 · answer #1 · answered by Anonymous · 0⤊ 0⤋
This is not a linear function . A linear function would be of the form y = mx + b, with m and b constant. You can find the slope (m) between any two points on it, and get -3/2, but when you try to find the y intercept (b) you get different results depednign on which point you pick. For example, when I worked out the point (-5,-7) I got b = 1/2 but when I worked out the point (-3, -10) I got b = -29/2. Try graphing these points and see what they look like.
However, i can see the rule to this function. Your x's are increasing by 2 and your y's are decreasing by 3. So the next few values in the table would be (1, -16), (3, -19), etc. Hope this helps.
For the largest river in the world, try googling rivers (lengths) and you'll get a comparison. It would most likely be either the Amazon or the Nile, look it up and find out for sure.
2006-12-13 19:41:10 · answer #2 · answered by Joni DaNerd 6 · 0⤊ 0⤋
the largest river in the world would probably be the Nile..
and the math i have someone do it 4 me
2006-12-13 19:27:39 · answer #3 · answered by Anonymous · 0⤊ 0⤋
f(x)= -3/2x - 1
Amazon River
Largest as in "Most Water Output"
Nile River
Longest.
2006-12-13 19:29:45 · answer #4 · answered by Neodudeman 1 · 0⤊ 0⤋