Question

How do I work out the equations of these lines? (I know some of them may be obvious but I need a method for none obvious ones)

Answer 1

Please note the white part is the area we want, the shaded part is the area we don't want

Answer 2

So we are only finding the equations right?

Answer 3

yes, such as
y> or equal to x
is the obvious one, but I need a method to work them out

Answer 4

Yeah another is
y is < or equal to x.
And another is x=1

Answer 5

no they are not.

the equations are
y> or equal to x
x+y < or equal to 8
x> or equal to 1

but I can not work them out

Answer 6

@satellite73 please help me? I am desperate on time, my exam is in 7 hours and I have not slept yet :(

Answer 7

all I see is picture, don't know what you want really?

Answer 8

I want to work out the equations of the lines from the graph

Answer 9

I need a method, as I can't work them out.
I got the answers of the mark scheme

Answer 10

so straight verticle line on thee right side is x=1

Answer 11

yes, and I know y=x, but I don't know how I would work out the other one

Answer 12

the other diagonal is
x+y=8

Answer 13

yes you can state that it is, but that doesn't help me

Answer 14

I don't know how you got x+y=8

Answer 15

x+y=8

set x=0 up there , what do you get
0+y=8
y=8


set y=0 up there, what do you get

Answer 16

but how do you know it is x+y=8
there must be some method to work that equation out.

Answer 17

so I got two coordinate
(0,8)
(8,0)

using, y-y1=m(x-x1)

(8)=m(-8)
m=-1

hence pluging into y=mx+b
b is y value when x=0

y=-1x+8
y+x=8

Answer 18

thank you very much! :D<3