help

[rough crypt]

im so confused

[uncut willow]

Its 2x+6

If you go one unit to the right your y goes up for 2 that’s how you find the m

[rough crypt]

oh

how did you work that out though

[uncut willow]

For the c just fill in a point for example (0;6)

I did it in my head.

[rough crypt]

is c the y intercept?

[calm whale]

m is the slope, c is the y intercept

[rough crypt]

ohh

[calm whale]

Only works for non-vertical straight lines

For vertical straight lines you can have the equation x = c where c is the x intercept

[uncut willow]

Indeed

[calm whale]

Or 0y = x - c

x = 0y + c

Kind of swaps the x and y

So back to y = mx + c

If you plug in 0 for x, it will give you y = c meaning (0,c) is on the line

So that is a proof that c is the y intercept

[rough crypt]

im still confused about the gradient

like on here the c = -4 right

i collected 2 points on the line

(2, 5) and (1, 1)

and gradient is change in y / change in x

so it should be 4

but it's not

[calm whale]

Well it’s supposed to be called slope not gradient

[rough crypt]

oh

well they call it gradient here in the uk

[calm whale]

Gradient is for functions with several inputs

Oh maybe it is a UK thing 😅

[rough crypt]

idk if my questions are just bugged out

[calm whale]

Your method is almost perfect

[rough crypt]

i keep trying to do the method

[calm whale]

1 little error however

(2,5) is not on the line

It would be (0, -4) and (1,1)

[rough crypt]

oh

thats probaly why i've been getting it wrong

[calm whale]

The line has to go through one of the crosses you see.

[rough crypt]

alright so here c = -3 and m = 5

oh it worked

thank you

this one here is different hm

why does y go up in increments of 5

that makes it so hard

[uncut willow]

Its 15x +10

go one unit to the right and see how much y increases that’s your m

For c just fill in a point with a zero in it

[rough crypt]

oh that makes sense now

[rough crypt]

.close