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Natasha_Volkova [10]
3 years ago
6

Brainliest for best answer

Mathematics
1 answer:
Ipatiy [6.2K]3 years ago
6 0
X in litres is 67% herbicide
y in litres is 46% herbicide
{x+y=42
{0.67x+0.46y=42*0.55

{67x+46y=2310
{46x+46y=1932

21x=378
x=18 litres

A. She need to use 18L

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the number 2 in the expression 5+2x is called the coefficient of x how does changing the coefficient to 6 change the meaning of
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11

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SOVA2 [1]
To find the solution, we use the substitution method. 

x+y=-1
<span>x-3y=11
</span>
x+y = -1-y
  -y       

x = -1-y

Now apply the value of x into the other equation.

x-3y=11
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Combine like terms

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Now, apply the value of Y to one equation to find x.

y = -3

x -3 = -1
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Now we have the value for both, x and y.
x = 2
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Final answer: A. <span>(2, −3)</span>
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pychu [463]

Answer:

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