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# quick Q watch

1. 2x + y <= 1 , <= means less than or equal to.

how do i know which part to shade in?
2. (Original post by [email protected])
2x + y <= 1 , <= means less than or equal to.

how do i know which part to shade in?
have you sketched the graph. if so you you have to shade in the part which it cant be. so shade above the line i think.

EDIT- i'm not sure which paty you're supposed to shade in. i was thinking about D1
3. that could be written as:

so draw y = f(x)
and then take any point that is on one side of the line (xo,yo), ( take (0,0) as it's easier to substitute and as long it doesnt lie on the line ). if f(xo) is greater than yo then at that side the statement is true, other wise the other side is true.

in this case: f(x) = 1 - 2x
y = 1 - 2x
take (0,0)
y = 1 - 0 = 1
so there y < 1 - 2x
4. (Original post by [email protected])
how do i know which part to shade in?
Normally, it specifies whether you shade in the area that satisfies the inequality or which doesn't in the question (GCSE papers often use either, seemingly at random).

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Updated: November 12, 2005
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