How to solve 2x + 2Y + 10z = 100 7x + 4Y = 200 17x + 7Y + 30z = 400

2X + 2Y + 10z = 100.1x + 4Y = 200.217x + 7Y + 30z = 400.3 from Formula 1, we can get x + y + 5Z = 50.43-4 * 6, 11x + y = 100.55 * 4-2, 43x = 200X = 200 / 43, substitute x = 200 / 43 into formula 2, we can get 200 / 43 + 4Y = 2004Y = 8600 / 43-200 / 434y = 8400 / 43y = 2100 / 43, substitute x = 200 / 43, y = 2100 / 43

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