Algebra (Need help desperately)

I really don't understand these.. can someone show me the correct way of doing them? (if it helps I will pay over paypal for detailed help or will pay in my services (I am a graphic designer, video editor, and web designer)
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1. Your computer-supply store sells two types of inkjet printers. The first, type A, costs $237 and you make a $22 profit on each one. The second, type B, costs $122 and you make a $19 profit on each one. You can order no more than 120 printers this month, and you need to make at least $2,400 profit on them. If you must order at least one of each type of printer, how many of each type of printer should you order if you want to minimize your cost?

Graph the system of constraints and find the value of x and y that maximize the objective function.

Constraints:
x ≥ 0
y ≥ 0
y ≤ (1)/(5) x + 2
5 ≤ y + x

Objective Function: C = 7x - 3y

a.(2.5, 2.5)
b.(0,2)
c.(0,0)
d.(5,0)
__________________________________

2. Your computer-supply store sells two types of inkjet printers. The first, type A, costs $237 and you make a $22 profit on each one. The second, type B, costs $122 and you make a $19 profit on each one. You can order no more than 120 printers this month, and you need to make at least $2,400 profit on them. If you must order at least one of each type of printer, how many of each type of printer should you order if you want to minimize your cost?

a. 69 of type A: 51 of type B
b. 40 of type A: 80 of type B
c. 51 of type A: 69 of type B
d. 80 of type A: 40 of type B
____________________________________

3. A factory can produce two products, x and y, with a profit approximated by P = 14x + 22y – 900. The production of y can exceed x by no more than 200 units. Moreover, production levels are limited by the formula x + 2y ≤ 1600. What production levels yield maximum profit?

a. x = 400; y = 600
b. x = 0; y = 0
c. x = 1,600; y = 0
d. x = 0; y = 200

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asked by Alex Lark
  1. take a visit to

    http://www.zweigmedia.com/RealWorld/LPGrapher/lpg.html

    and you can play around with this stuff.

    1. 👍 0
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    posted by Steve
  2. Thanks :D I'm 90% sure number 1 is D, but do a good way how I could do 2 or 3? If you don't mind explaining to me?

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    posted by Greg

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