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Bess [88]
3 years ago
12

If x = 4, y = 2 and z = 1 then xz (4y - 2z) is: 861, 24, 46, or 40. Help please.

Mathematics
1 answer:
dybincka [34]3 years ago
8 0
(4)(1) * (4(2)-2(1))
4 * (8-2)
4*6
24
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Use the Chain Rule (Calculus 2)
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1. By the chain rule,

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I'm going to switch up the notation to save space, so for example, z_x is shorthand for \frac{\partial z}{\partial x}.

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Similarly,

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If that's the case, then

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z=\sin x\cos y\implies\begin{cases}z_x=\cos x\cos y=\cos(s+t)\cos(s^2t)\\z_y=-\sin x\sin y=-\sin(s+t)\sin(s^2t)\end{cases}

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<span>5x - y = 15 (1)
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<span>---------------------------add
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answer
</span><span>infinitely many solutions</span><span>

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