# Help with graphing

1. Relevant equations
1) Let X = [0,4] ⊂ R and y = f (x) = 2 - x/2. Describe the set { x : f (x) < 1, x ∈
X} and graph the set { (x,y) : y = f (x) < 1, x ∈ X} in the co-ordinate plane.

2) Let X = R2+ \{(0,0)} and y = f (x) = x2 /x1. Graph the set { x : f (x) = 1, x ∈ X}
in the co-ordinate plane.

2. The attempt at a solution

1) I am not sure what "Let X = [0,4] ⊂ R" means. As for the graph, is it not merely a line like this "\" stopping just before y = 1?

2) Is it not merely a horizontal line at y = 1?

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Ray Vickson
Homework Helper
Dearly Missed
1. Relevant equations
1) Let X = [0,4] ⊂ R and y = f (x) = 2 - x/2. Describe the set { x : f (x) < 1, x ∈
X} and graph the set { (x,y) : y = f (x) < 1, x ∈ X} in the co-ordinate plane.

2) Let X = R2+ \{(0,0)} and y = f (x) = x2 /x1. Graph the set { x : f (x) = 1, x ∈ X}
in the co-ordinate plane.

2. The attempt at a solution

1) I am not sure what "Let X = [0,4] ⊂ R" means. As for the graph, is it not merely a line like this "\" stopping just before y = 1?

2) Is it not merely a horizontal line at y = 1?
Do you know what the notation [0,4] means? And the answer is YES to your other questions.

RGV

Do you know what the notation [0,4] means? And the answer is YES to your other questions.

RGV
Yes, I'm know 100% what that notation means... If it means something different than what's in the equation, please tell me, if not, thanks a lot for the help, I really appreciate it.

HallsofIvy