1.

15. Solve the following pairs of equations3x+y + 3x-y = 4 and 2(3x + y)一2(3x-y) =-8

Answer»

1/(3x+y) + 1/(3x-y)=3/4....(1)

1/2(3x+y) + 1/2(3x-y)=1/81/(3x+y) + 1/(3x-y)=1/4....(2)

Subtract 1 from 2

Slope same, Parallel linesno solution



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