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anonymous
 3 years ago
solve my substitution (medal and fan)
x  y  z = 8
4x + 4y + 5z = 7
2x + 2z = 4
anonymous
 3 years ago
solve my substitution (medal and fan) x  y  z = 8 4x + 4y + 5z = 7 2x + 2z = 4

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texaschic101
 3 years ago
Best ResponseYou've already chosen the best response.12x + 2z = 4 2x = 2z + 4 x = z + 2 x  y  z = 8 (z + 2)  y  z = 8 z  2  y  z = 8 2  y = 8 y = 8 + 2 y = 6 y = 6 4x + 4y + 5z = 7 4(z + 2) + 4(6) + 5z = 7 4z  8 + 24 + 5z = 7 9z + 16 = 7 9z = 7  16 9z =  9 z = 1 x = z + 2 x = (1) + 2 x = 1 + 2 x = 3 lets check it now... x  y  z = 8 3  6 (1) = 8 9 + 1 = 8 8 = 8 (correct) check.. 4x + 4y + 5z = 7 4(3) + 4(6) + 5(1) = 7 12 + 24  5 = 7  17 + 24 = 7 7 = 7 (correct) your answer is : x = 3, y = 6, and z = 1 or (3,6,1)
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