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JulijaS [17]
3 years ago
13

System with 3 variable. solve pleaseeee x+4y-5z=-7 3x+2y+3z=7 2x+y+5z=8

Mathematics
1 answer:
7nadin3 [17]3 years ago
6 0
To solve this we need to form 2 equations with only 2 variables.
x+4y-5z=-7
2x+y+5z=8
3x+5y=1

15x+10y+15z=35
6x+3y+15z=24
9x+7y=11

Now we need to use these to find x and y
9x+15y=3
9x+7y=11
8y=-8
y=-1
Therefore:
x=2
From this we can find that:
2(2)-1+5z=8
Therefore z=1
The answer is x=2, y=-1, z=1
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Began with a temperature of -10 and ended after 8 minutes at a temperature of 0 which graph represents same relationship between
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3 years ago
2y +3=4y-29<br> Plz help
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Answer:

y = 16

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6 0
3 years ago
Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent f
Ksivusya [100]

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If a mixture of X and Y contains 30 percent ryegrass,

Let total seed mixture be 100

So, for seed X = x

For seed Y = 100-x

So, According to question,

0.4x+0.25(100-x)=30\\\\0.4x+25-0.25x=30\\\\0.15x=30-25\\\\0.15x=5\\\\x=\dfrac{5}{0.15}\\\\x=\dfrac{100}{3}

So, weight of mixture X is given by

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Hence, the weight of X is 33\dfrac{1}{3}\% of weight of mixture.

6 0
3 years ago
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