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3 years ago

Solve for the missing side

Mathematics

1 answer:

tester [92]3 years ago

5 0

Step-by-step explanation:

give some hint

but I think the answer should be 8

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How do you solve -x-y-3z=-9 z=3x-1 x-5y+z=21 using elimination

jenyasd209 [6]

Assuming these are three separate problems, I have solved them for you below.

1.) $-x - y - 3z = -9$

$⇒ -x + (-y + y) + (-3z + 3z) = -9 + 3z + y$

$⇒ -x = -9 + 3z + y$

Multiply the whole thing by -1 so x is positive.

$x = 9 - 3z - y$

2.) $z = -3x - 1$

⇒ $z + 1 = -3x + (-1 + 1)$

⇒ $z + 1 = -3x$

Isolate x⇒ $\frac{z + 1 = -3x}{-3}$

⇒ $\frac{1}{3}z + \frac{1}{3} = x$

3.) $x - 5y + z = 21$

⇒ $(-x + x) + -5y + (z - z) = 21 - z - x$

⇒ $\frac{-5y = 21 - z - x}{-5}$

⇒ $y = \frac{1}{5}x + \frac{1}{5}z - \frac{21}{5}$

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3 years ago

Which equation can be used to find x?

Reika [66]

the last equation would be the answer

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4 years ago

Compare the following decimals using <, >, or =.

Vlad1618 [11]

B it is equal to 1.1000 it doesn't mater how many decimals zeros are after the decimal point their can be 1.1000000000000 and it would still be B. if it was before the decimal point then we would have a different story.

Answer (B)

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4 years ago

From 5x^2-6x+8, subtract 3x^2-2x-4?

victus00 [196]

$(5x^2-6x+8)-(3x^2-2x-4)=\\5x^2-6x+8-3x^2+2x+4=2x^2-4x+12$

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4 years ago

A large tank is filled to capacity with 400 gallons of pure water. Brine containing 5 pounds of salt per gallon is pumped into t

Thepotemich [5.8K]

Answer:

If is the amount of salt in the tank at time , then the rate at which the amount of salt in the tank changes is given by

Let's drop the units for now. We have

We're given that the water is pure at the start, so , giving

So the amount of salt in the tank (in lbs) at time is

Step-by-step explanation:

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3 years ago