All categories

3 years ago

Y * x = 20 y + x = 9 what numbers are y and x equal to?

1 answer:

4 0

$y = 9 - x$
Substitute into
$y \times x = 20 \\ (9 - x) \times x = 20 \\ { - x}^{2} + 9x = 20 \\ {x}^{2} - 9x + 20 = 0 \\ (x - 5)(x -4) = 0 \\ x = 5 \: or \: x = 4$
When x = 5,
$y = 9 - 5 \\ y = 4$
When x = 4,
$y = 9 - 4 \\ y = 5$

x = 5, y = 4
x = 4, y = 5

Hope this helps. - M

You might be interested in

Milly measured a cereal box. It is two inches wide,six inches long, and twelve inches tall. What is the volume of the cereal box

insens350 [35]

Answer:

144

Step-by-step explanation:

Multiply the Sizes To Each Other

3 0

3 years ago

Why is the number that satisfies this equation not a real number?<br> x^2=--1

Yuri [45]

Answer:

I assume that says $x^2=-1$ , but that is the case because when we square a number, we can NEVER get a negative number. The smallest square we can get is 0. 1^2 is 1, and no real number squared gives us a negative number.

Step-by-step explanation:

4 0

3 years ago

Bonita deposited 1300 into a bank account that earned 5.75% simple interest each year. She earned $299 in interest before closin

worty [1.4K]

Answer:

For 4 years the money was in the account .

Step-by-step explanation:

Formula

$Simple\ interest = \frac{Principle\times Rate\times Time}{100}$

As given

Bonita deposited 1300 into a bank account that earned 5.75% simple interest each year.

She earned $299 in interest before closing the account.

Principle = $1300

Rate = 5.75%

Simple interest = $299

Putting all the values in the formula

$299 = \frac{1300\times 5.75\times Time}{100}$

$Time= \frac{299\times 100}{1300\times 5.75}$

$Time= \frac{29900\times 100}{1300\times 575}$

$Time= \frac{2990000}{747500}$

Time = 4 years

Therefore for 4 years the money was in the account .

8 0

3 years ago

Find f(-3) if f(x) = x?

icang [17]

Answer:

f(-3)=-3

Step-by-step explanation:

You simply sub in the (-3) for x

4 0

3 years ago

Debbie quits her job, which pays $30,000 a year, to finish her college degree. Her annual college expenses are $10,000 for tuiti

Rom4ik [11]

Answer:

Debbie's opportunity cost of attending college for the year is $42,000.

Step-by-step explanation:

Debbie quits her job, which pays $30,000 a year, to finish her college degree.

Her annual college expenses are $10,000 for tuition, $2,000 for books, and $700 for food.

So, her opportunity cost will include the amount of salary she could have earned if she continued working plus the cost of tuition plus the cost of books:

$30000+10000+2000=42000$ dollars

Therefore, Debbie's opportunity cost of attending college for the year is $42,000.

4 0

4 years ago