z = 5y - 2x + 9
when x=10 and y=3,
z = 5*3 -2 *10 +9 = 15 - 20 + 9 = 4
2007-09-09 12:43:51
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answer #1
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answered by spongeworthy_us 6
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Write the Linear equation 2x-5y+z=9 as a function of x and y. Then evaluate the function when x=10 and y=3
x = (5y +9 -z)/2
y= (9-2x-z)/5
z = 9 - 2x +5y
2(10) - 5(3) +z = 9
20-15 +z = 9
z = 4
2007-09-09 12:45:58
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answer #2
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answered by ignoramus 7
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write as a function of x and y — this means x and y are the independent variables and z is dependent. In other words, z = some function of x and y. Solve for z...
2x - 5y + z = 9
z = 9 - 2x + 5y
Answer: z(x, y) = 9 - 2x + 5y
z(10, 3) = 9 - 2(10) + 5(3)
= 9 - 20 + 15
= 4
2007-09-09 12:43:37
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answer #3
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answered by computerguy103 6
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The function of x and y is:
z = 5y - 2x + 9.
For x = 10 and y = 3, this gives z = 15 - 20 + 9 = 4.
[CHECK. In the original equation, we will have
2*10 - 5*3 + 4 = 20 - 15 + 4 = 5 + 4 = 9. It checks.
It's always good to do such a check; in fact, that's how I found a sign error in my first attempt!]
Live long and prosper.
2007-09-09 12:41:57
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answer #4
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answered by Dr Spock 6
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Since nobody got it right yet, I'll chime in: z = 5y - 2x + 9 = 5 Ã 3 - 2 Ã 10 + 9 = 15 - 20 + 9 = 4
Yeah, sure. now they see it and fix it and everybody else pipes up! :)
2007-09-09 12:46:11
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answer #5
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answered by Anonymous
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x=(5y-z+9)/2
y=(2x+z-9)/5
Evaluation:
When x=10 and y=3, substitute in the 1st function, we'll have:
10=(15-z+9)2 therefore z=4
Then substitute in the 2nd function, we'll have:
3=(20+z-9)/5, therefore z=4
2007-09-09 12:53:40
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answer #6
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answered by Anonymous
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2x-5y+z=9
put x=10 and y=3
20-15+z=9
5+z=9
z=4, then back to the first equation and put z=4
2x-5y+4=9
2x-5y=5
or 5y=2x-5
y=(2x-5)/5
2007-09-09 12:44:32
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answer #7
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answered by Sean 1
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plug in the numbers and you get 4. Dont know what everyone else is smoking.
Your supposed to get
20-15+z=9
5+z=9
z=4
2007-09-09 12:45:46
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answer #8
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answered by Tigris 2
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I plugged it in
20-15+z=9
5
9-5=4 now z=4
Hope I did it the way that you wanted it.
2007-09-09 12:45:03
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answer #9
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answered by Successor 5
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do it step by step:
2x-
2x10=20
5y-
5x3=15
so:
20-15+z=9
now u just solve that it is a pre-algebra question now
20-15=5, 5+4=9
So z=4!
2007-09-09 12:48:02
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answer #10
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answered by May 2
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