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WK7HW &acirc;€“ JO

# WK7HW &acirc;€“ JO - r = 5/2(5/2-5/2 35 Multiply...

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WK7HW – JO Section 6.1 3. 3x – y = 1 x + 2y = -9 y = 3x - 1 x + 2(3x - 1) = -9 x - 2 + 6x = -9 7x - 2 = -9 -9 + 2 7x = -7 7/-7 = -1 x = -1 3(-1) – y = 1 -3 – y = 1 -3 – 1 = -4 y = -4 (-1, -4) 5. 3x – 2y = 4 2x + y = -1 y = -1 – 2x 3x – 2(-1 – 2x) = 4 3x + 2 + 4x = 4 7x + 2 = 4

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7x = 2 x = 2/7 y = -1 – 2(2/7) y = -1 – 4/7 y = - 11/7 (2/7, -11/7) 7 .  r + s = 0 r – s = 5 r = 0 – s 0 – s – s = 5 0 – 2s = 5 -2s = 5 s = -5/2 r + (– 5/2) = 0
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Unformatted text preview: r = 5/2 (5/2, -5/2) 35. Multiply the second equation by -1 3x + z + 2w +18v = 0-4x + y - w - 24v = 0 7x – y + z + 3w + 42v = 0 4x + z + 2w + 24v = 0 37. Replace the second equation by the sum of itself and -2 times the first equation x + y + 2z + 3w = 1 -y - 1z - 2w = -1 3x + y + 4z + 5w = 2 2x + y + 3z + 4w = 1 x + y + 2z + 3w = 1-2x – 2y - 4z -6w = -2-y - 1z – 2w = -1...
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