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3 years ago

What is y= -2/5x-2 y=-4

Mathematics

1 answer:

MaRussiya [10]3 years ago

3 0

Answer:

y=−4 and x=5

Step-by-step explanation:

y=−4;y=(

(−2)

)(x)−2

Step: Solvey=−4for y:

Step: Substitute−4foryiny=

−2

x−2:

−2

x−2

−4=

−2

x−2

−4+

−2

x−2+

x(Add 2/5x to both sides)

x−4=−2

x−4+4=−2+4(Add 4 to both sides)

x=2

(Divide both sides by 2/5)

x=5

Answer:

y=−4 and x=5

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Answer:

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Step-by-step explanation:

Set up a table like this (this is the same table for any mixture problem):

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What you do with this table is multiply the first 2 columns and they equal the last column. We already know the middle column's entries from what we are given. But remember that a percent needs to be expressed as a decimal:

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Now we also know that the total he wants to make is 380 mL that is 12%, so all that info goes into the last row:

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If he wants this total mixture to come from the 8% and the 13% vinegars, he is mixing them together, or adding them. We need to know how much 8% + how much 13% will give us 380 mL of 12%. So we can fill in the amounts accordingly. If he has x mL of 8%, then he will have 380 - x of 13%. The table tells us that we are multiplying the first 2 columns to get the third, so we will do that at the same time:

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13% 380 - x * .13 = .13(380 - x)

total % 380 * .12 = 45.6

Since we are adding the different vinegars together to get the total, we can do that with the last column as well. This is our equation:

.08x + .13(380 - x) = 45.6 Multiply everything through by 100 to get rid of the decimals now:

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Answer:

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Answer:

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An equation of the form ax+by+c=0, where x, y are variable, and a, b, c are numbers, is called a "linear equation"

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I am joyous to assist you anytime.

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