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# D1 Linear Programming Watch

1. Hi, i can normally do linear programming on D1 quite well however this question is really confusing me.

Here is the question:

The answer I got for the top constraint was x = 2y + 15, but the actual answer is x = 2y + 30 (The sign should be greater than or equal to but idk how to put that in)

Thanks!

2. (Original post by ali.s1002)
Hi, i can normally do linear programming on D1 quite well however this question is really confusing me.

Here is the question:

The answer I got for the top constraint was x = 2y + 15, but the actual answer is x = 2y + 30 (The sign should be greater than or equal to but idk how to put that in)

Thanks!

Equation for a line is , where m is the gradient and c is the y-intercept.

The gradient is 1/2, and the y-intercept is 15, so the equation of the line is:

3. (Original post by justinawe)
Equation for a line is , where m is the gradient and c is the y-intercept.

The gradient is 1/2, and the y-intercept is 15, so the equation of the line is:

Ah of course I should have noticed that, thank you!
4. so would they be y < 1/2 x + 15 and y > 1/4 x?
5. (Original post by MrDobney)
so would they be y < 1/2 x + 15 and y > 1/4 x?
I'd think you want <= and >=, but other than that, yes.

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