Question 148090
In this case, since they gave you a single point at (8,6), apply that point to each of the given equations:
a. 5x-3y=22
5(8)-3y=22
40-3y=22
-3y=-18
y = 6 
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b. 3/5x + 8/5
3/5(8) + 8/5
24/5 + 8/5
32/5 (Does NOT equal 6 -- toss it out)
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c. 3x + 4y = 48
3(8) + 4y = 48
24 + 4y = 48
4y = 24
y = 6
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d. -4x + 2y = -16
-4(8) + 2y = -16
-32 + 2y = -16
2y = 32
y = 16 (Does NOT equal 6 -- toss it out)
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Right now, it could either be 'a' or 'c'
a. 5x-3y=22
c. 3x + 4y = 48
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I would think, at this point, that you could possibly have a typo when you keyed it in.  Can you verify that the problem is typed in correctly?
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Or, if you proceeded, the other piece of information given was (2,)
we could try to plug it into both 'a' and 'c':
a. 5x-3y=22
5(2)-3y=22
10-3y=22
-3y=12
y = -4
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c. 3x + 4y = 48
3(2) + 4y = 48
6 + 4y = 48
4y = 42
y = 10.5