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3 years ago

How many solutions does the system of equations below have?

Mathematics

2 answers:

BaLLatris [955]3 years ago

6 0

Answer:

C: none

Step-by-step explanation:

Here we have two separate functions named 'y.' Eliminate 'y' temporarily by equating these functions together:

x + 2 = y = x - 1

Subtracting x from both sides, we get:

0 + 2 = y = 0 - 1, or

2 = -1

This is never true, so C is the correct answer: NO solutions.

An easier way in which to do this problem is to visualize the graphs of

y = x + 2 and y = x - 1. The graphs are parallel straight lines; they never intersect, and therefore we can conclude "no solution."

galben [10]3 years ago

4 0

Answer:

Step-by-step explanation:

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3 years ago

The half life of a radioactive substance is one day meaning that every day half of the substance has decayed . Suppose you have

adelina 88 [10]

Answer:

model: $P(t) = 399 * (0.5)^t$

amount after 6 days: $P(6) = 6.2344\ grams$

Step-by-step explanation:

We can use the exponencial function of growth/decay to model this problem:

$P(t) = Po * (1 + r)^t$

Where P(t) is the final value after time t, Po is the inicial value and r is the rate of change.

In our case, the inicial value is 399 grams, the rate is -0.5 (that is, the value decreases by half in each time cycle), and t is the time in days.

So our function will be:

$P(t) = 399 * (0.5)^t$

Then, to find the amount of substance after 6 days, we just need to calculate P using t = 6:

$P(6) = 399 * (0.5)^6$

$P(6) = 6.2344\ grams$

4 0

3 years ago

Which property of multiplication was used to rewrite -5(8+4)−35 as -40+(-20)−35 ?

Gala2k [10]

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3 years ago

Solve this for brainliest<br> y = x + a<br> make x the subject

Scorpion4ik [409]

Answer:

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Step-by-step explanation:

y = x + a ( subtract a from both sides )

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2 years ago

Read 2 more answers

Express the ratio below in its simplest form. 3 1 2 : 4.5

cupoosta [38]

Answer:

69.3

Step-by-step explanation:

Divide both sides by 4.5

312/4.5 : 4.5/4.5

69.3 : 1

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4 years ago