Question 699728
1. 7x-3y=-23        2. x-y=3           3. x-y=3          4. 7x+2y=24       

    x+5y=32               2x-2y=6          2x-2y=6           x+2y=0


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1. Multiply thru the bottom equation by 7.
7x - 3y = -23
7x +35y = 234
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Subtract and solve for "y":
38y = 257
y = 6.76
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Solve for "x" using x + 5y = 32
x + 5(6.76) = 32
x + 33.82= 32
x = -1.82
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2.  x-y = 3
    2x-2y=6 
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Multiply thru the top equation by 2:
   2x - 2y =6
   2x - 2y = 6
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Ans: All points of the form (x, x-3)
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Etc.
Cheers,
Stan H.