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3 years ago

Please help me with this ! ! ! ! !

Mathematics

2 answers:

melisa1 [442]3 years ago

8 0

Answer:

First choice: m = -4

Step-by-step explanation:

The second equation is already solved for n, so lets's use the substitution method and substitute m - 2 for n in the first equation.

m - 2n = 8

m - 2(m - 2) = 8

m - 2m + 4 = 8

-m + 4 = 8

-m = 4

m = -4

kodGreya [7K]3 years ago

4 0

The second equation tells you what 'n' is. It's "m-2" .

So you can simply write "m-2" in place of 'n' in the first equation.

Then the first equation says [ m - 2(m-2) = 8 ], and you should have no trouble solving that.

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the sum of three numbers is twenty. the second number is four times the first and the sum of the first and third is eight. what

8090 [49]

Let's call the three numbers x, y, and z.

The numbers are 3, 12, and 5.
x + y + z = 20
y = 4x
x + z = 8
We can rewrite the first equation because y is 4x, so
x + 4x + z = 20
5x + z = 20
And now we can use simultaneous equation rules to solve

5x + z = 20
x + z = 8

5x + z = 20
5x + 5z = 40
(subtract)
-4z + -20
÷ -4
z = 5

x + z = 8
x + 5 = 8
x = 3

y = 4x
y = 4 × 3
y = 12

I hope this helps!

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3 years ago

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Answer:

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3 years ago

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1 year ago

Linear equation 4.5 + 1.5y=24 x-y=4

WARRIOR [948]

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3 years ago

A scuba diver dove from the surface of the ocean to an elevation of −49 9/10 feet at a rate of −9.5 feet per minute. After spend

laila [671]

Answer:

Rate of change = 4,06 f/min

Step-by-step explanation:

The ascendent length 28 9/10 = 289/ 10

The time for that ascendent maneuver is total time 17 1/8 minutes - spended time in the elevation 10 minutes, then

17 1/8 = 137/8

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289 / 10 / 57/8

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