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Why bother with a post grad course - waste of time? 17-10-2016
1. Hi , im stuck on this question :
Find the gradient of the lines joining the following pairs of points:
A=(p+3,q-7)
B=(p+5,3-q )
2. y2-y1/x2-x1
3. The Gradient of the line joining 2 points is the change in Y value divided by the change in X value.

To find the change of either value, just take one away from the other. (y1-y2)/(x1-x2)

So,

(P+3)-(P+5) = P + 3 - P - 5 = -2. Change in X = -2

(Q-7)-(3-Q) = Q - 7 - 3 + Q = 2Q -10 Change in Y= 2Q-10

Therefore

Becoming

-Q + 10
4. (Original post by Workaholism)
(FULL SOLUTION)
That's some nice working out. Can you solve this for me? I need the general solution. Thanks.

using substitution ?

Spoiler:
Show
Don't post full solutions.
5. (Original post by RDKGames)
That's some nice working out. Can you solve this for me? I need the general solution. Thanks.

using substitution ?
Spoiler:
Show
Don't post full solutions.
Spoiler:
Show
.
Solve .
6. (Original post by RDKGames)
That's some nice working out. Can you solve this for me? I need the general solution. Thanks.

using substitution ?

Spoiler:
Show
Don't post full solutions.
Huh? Why not?
7. (Original post by Workaholism)
Huh? Why not?
Well apart from it being against the posting rules, you are also doing the question for the person. Just give them hints like the first reply and let them figure it out on their own.

(Original post by B_9710)
Spoiler:
Show
.
Solve .
Spoiler:
Show

Solve:
8. (Original post by RDKGames)
Well apart from it being against the posting rules, you are also doing the question for the person. Just give them hints like the first reply and let them figure it out on their own.
Spoiler:
Show

Solve:
Spoiler:
Show
.
9. (Original post by B_9710)
Spoiler:
Show
.
Spoiler:
Show
Is it
?
10. (Original post by RDKGames)
Spoiler:
Show
Is it
?
No.
11. (Original post by B_9710)
No.
Well damn, if Wolfram Alpha doesn't give me the right answer I don't know what will.
12. Alright, enough with the off topic DE's, don't you think?
13. (Original post by Zacken)
Alright, enough with the off topic DE's, don't you think?
They're spoilered so it's fine.
14. (Original post by Workaholism)
The Gradient of the line joining 2 points is the change in Y value divided by the change in X value.

To find the change of either value, just take one away from the other. (y1-y2)/(x1-x2)

So,

(P+3)-(P+5) = P + 3 - P - 5 = -2. Change in X = -2

(Q-7)-(3-Q) = Q - 7 - 3 + Q = 2Q -10 Change in Y= 2Q-10

Therefore

Becoming

-Q + 10
Your final answer should be -Q + 5, as (-10)/(-2) = 5.

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