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3 years ago

Please help!! I'll give 50 points

Mathematics

2 answers:

Scrat [10]3 years ago

3 0

Answer: y=0 and x=3

Step 1: Solve for x in 2x+9y=6.

$2x+9y=6$

$2x=6-9y$ (Subtract 9y from both sides)

$x=3 - 4.5y$ ( Divide both sides by 2)

Step 2: Replace x with 3-4.5y

$-7x - 8y = -21\\-7(3-4.5y) - 8y = -21\\$

Step 3: Solve for y

$(-21)+31.5y-8y=(-21)$ (By looking at this, we can determine that y=0)

Step 4: Replace y with 0

$2x+9y=6\\2x+9(0)=6\\2x=6\\$

$x=3$ (Divide both sides 2)

Therefore, y=0 and x=3

lesya692 [45]3 years ago

3 0

Answer: y=0 and x=3

Step-by-step explanation:

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WILL GIVE BRAINLIEST NEED HELP ASAP THANK YOU <3

AleksandrR [38]

Answer: C.

Step-by-step explanation:

C. Without a table or graph, you might forget what an equation represents.

Hope this helps!!! Good luck!!! :)

3 0

3 years ago

Solve the system by substitution.<br> - 8x + y = -32<br> - 3x – 10 = y<br> (,)

agasfer [191]

Answer:

$x=2,\:y=-16$

Step-by-step explanation:

$\begin{bmatrix}-8x+y=-32\\ -3x-10=y\end{bmatrix}\\\\\mathrm{Isolate}\:x\:\mathrm{for}\:-8x+y=-32:\quad x=-\frac{-32-y}{8}\\\\\mathrm{Subsititute\:}x=-\frac{-32-y}{8}\\\begin{bmatrix}-3\left(-\frac{-32-y}{8}\right)-10=y\end{bmatrix}\\\\Simplify\\\begin{bmatrix}\frac{3\left(-32-y\right)}{8}-10=y\end{bmatrix}\\\\\mathrm{Isolate}\:y\:\mathrm{for}\:\frac{3\left(-32-y\right)}{8}-10=y:\quad y=-16\\\\\mathrm{For\:}x=-\frac{-32-y}{8}\\\\\mathrm{Subsititute\:}y=-16\\x=-\frac{-32-\left(-16\right)}{8}\\$

$-\frac{-32-\left(-16\right)}{8}=2\\x=2\\x=2,\:y=-16$

3 0

3 years ago

Read 2 more answers

Clayton and Timothy took different sections of Introduction to Economics. Each section had a different final exam. Timothy score

Andrews [41]

Answer: Fourth option is correct.

Step-by-step explanation:

Since we have given that

Timothy scored 83 out of 100.

His percentile rank in his class = 72

Clayton scored 85 out of 100.

His percentile rank in his class = 70.

Since Clayton's percentile rank is lower than Timothy's rank.

So, Timothy performed better with respect to the rest of the students in the class.

Hence, Timothy as his percentile score is higher.

Therefore, Fourth option is correct.

5 0

3 years ago

During swim practice Brandi swam 6 butterfly stroke laps and 8 freestyle laps. What is the ratio of freestyle laps to total laps

densk [106]

Answer:

4:7

Edit: I just saw the multiple choice options, in this case the right answer is:

but they're both equal

Step-by-step explanation:

The ratio you are looking for is

freestyle laps : (freestyle + butterfly) laps

so:

8 : (6+8)

8:14

Divide by 2 to simplify

4:7

7 0

3 years ago

Use the formula for compound interest, a P 1 i n = ^ h + , to determine how many years it will take for an investment of W10 000

Sergeu [11.5K]

The money will be triple after 15 years and 303 days.

What is compound interest?

Compound interest, also known as interest on principal and interest, is the practice of adding interest to the principal amount of a loan or deposit.

Given:

Principle (P) = $10,000

The amount will be triple.

So, Amount (A) = $30,000

Rate (r) = 7% = 0.07

The interest is compounded quarterly.

n = 4

We have to find the value of t.

Let,

$A = P(1+\frac{r}{n})^n^t\\ 30000 = 10000(1+\frac{0.07}{4})^4^t\\\frac{30000}{10000} = (1 + 0.0175)^4^t\\ 3 = (1.0175)^4^t$

Apply logarithm on both sides,

$log(3) = log(1.0175)^4^t\\log(3) = 4t log(1.0175)\\t = \frac{log(3)}{4(log(1.0175))} \\t = \frac{0.4771212547}{4(0.0075344179)} \\t = \frac{0.4771212547}{0.0301376716} \\t = 15.83139$

Hence, the money will be triple after 15 years and 303 days.

To know more about compound interest, click on the link

brainly.com/question/24274034

#SPJ4

6 0

1 year ago