Book Maths Puzzle Algebra

Solve the system
x + y + z = 6
3x + 4y - 7z = 1
2x - y + 3z = 5

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Book Other Question

I have $850 to replace a patio. I'm making a square concrete patio with a brick border that is 8 inches wide around the outer edge of the ratio and the total length of a side is 2 Chris has invested $2,300 in two small businesses. last year, the greeting card business made a 14% profit on her investment in the business, while the bicycle repair business showed a 6% loss. If chris' net profit from the two businesses was $102, her investment in the greeting card business was $____?