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Pretty simple question, just need some help

Basically for some homework i gotta find the equation of the line that passes through these two points

( 1 , 4 ) ( 7 , 10 )

i know gradient is (10 - 4)/ (7 - 1)

so gradient is 6/5x

but need to know where to go from here

Reply 1

boromir9111

y - y_1 = m(x-x_1)

m = gradient....sub in the values and rearrange to get y and you're sorted :smile:

(edited 13 years ago)

Reply 2

jimbo lad

ah yes cheers m8, how stupid. ty

Reply 3

boromir9111

No question is stupid :smile:

anytime!

Reply 4

ghostwalker

jimbo lad

i know gradient is (10 - 4)/ (7 - 1)

so gradient is 6/5x

You might want to check that arithematic.

Reply 5

boromir9111

^^ agreed, totally missed that.

Reply 6

Mr M

Study Forum Helper

ghostwalker

You might want to check that arithematic.

Eh?

I'm not keen on the x following his number either.

Reply 7

boromir9111

Spelling nazi's in the math forum.....dear me, what will they think of next lol....

Reply 8

Extricated

the gradient is 1 not 6/5x, a gradient never has an x attached to it

Reply 9

Mr M

Study Forum Helper

boromir9111

Spelling nazi's in the math forum.....dear me, what will they think of next lol....

Isn't arithematic a member of Scissor Sisters?

Reply 10

anonanon123123

y = mx + c

you worked out m, and you have two examples of (x,y) pairs that definitely work (since the whole point is that it passes through them), so use that to find c, and once you have m and c that's it, you've uniquely defined the line.

Reply 11

ghostwalker

Mr M

Eh?

I'm not keen on the x following his number either.

I was more concerned with the 7-1.

And I always have to think when it comes to spelling arithmetic, unfortunately my fingers don't always type what's gong (!) through my head, so two opportunties to screw up.

Reply 12

boromir9111

Mr M

Isn't arithematic a member of Scissor Sisters?

Cool picture. Where did you get that from? Not sure your Mrs would be too fond of it lol :p:

Reply 13

Mr M

Study Forum Helper

boromir9111

Cool picture. Where did you get that from? Not sure your Mrs would be too fond of it lol :p:

She's reading over my shoulder. Stop trying to get me into trouble.

Reply 14

boromir9111

Mr M

She's reading over my shoulder. Stop trying to get me into trouble.

Lol. Nice try. You should give comedy a try along side teaching maths, you seriously have some talent there :biggrin:

(edited 13 years ago)

Reply 15

jimbo lad

haha sorry peeps i feel well silly now, and ye i know about the x thing but i usually put it there just for working things out because it helps me to understand its the gradient.