MATHEMATICS MIDDLE SCHOOL

PLEASE HELP!!!
if x varies directly with y, and x=9 when y =6, find x when y = 15
explain

Answers

Answer 1

Answer:

Direct variation problems use the equation y = kx

Replace y and X with the two known numbers to solve for k:

6=k9

Solve for K by dividing both sides by 9:

k = 6/9, reduces to 2/3

Now replace y and k into the formula to solve for x:

15 = 2/3x

Solve for X by dividing both sides by 2/3:

X = 15 / 2/3

X = 45/2 as an improper fraction, 22 1/2 as a proper fraction or 22.5 as a decimal.

Not sure which format the answer needs to be in, so I gave all three.

Related Questions

Maddie bought 10 quarts of ice cream. how many gallons and quarts of ice cream did maddie buy.
PLease help 10 pointsSeven years from now the age (a) of Jose will be __________. Which expression matches this situation? A) 7a B) a - 7 C) a + 7 D) 7 - a
14. Harry needs to buy hamburgers and hot dogs for a picnic. He has only $41.00 to spend and must buy AT LEAST 98hamburgers or hot dogs. A store charges $.50 per hamburger and $0.25 per hot dog. Which of the following is apossible way Harry might buy the hamburgers and hot dogs?69 hamburgers and 28 hot dogs64 hamburgers and 35 hot dogs66 hamburgers and 33 hot dogs78 hamburgers and 20 hot dogs
Help please!! please answer ASAP... I NEED HELP...i feel soo dumb...
sara buys a sweater at a department store the sweater costs $30 the store is having a 25% off sale on everything in the store. enter the amount od money in dollars sara saves from the sale do not consider the sales tax

The soccer league needs to transport all 133 players to the tournament if 4 players can ride in one car how many cars are needed...PLZ HELP ALSO I NEED TO SHOW MY WORK

Answers

You would need 34 cars.
133/4 = 33.25
Since you cannot have 33.25 cars, you can have 34 cars.
34 * 4 = 132.
This means that one of the players is going to ride alone, whereas in all of the other cars there will be 4 players.

What is a irrational number by a circumference

Answers

A real number is rational, if it is the ratio of two integers. Otherwise it is called irrational. If D is the diameter of circle, then C = π D is it's circumference.

What is the exponential form of the following equation? logb3 = -8

Answers

assuming b is the underscript of log, the formula is log _b_3=-8.

the formula for log is usually log_b_x=n, and to convert it to exponential would be the same as b^n=x

just fill in the numbers, b is still b, and -8 will be the in place of n, equal to 3.

b^-8=3

How many feet are in 78 inches?

Answers

Answer:

6 1/2 feet

Step-by-step explanation:

There are 12 inches in 1 foot.

Divide 78 inches with 12 inches to get the amount of foot 78 inches equals to.

78/12 = 6.5

6 1/2 feet is your answer

There are 6.5 feet in 78 inches. Hope this helps.

The ratio of adults to children at a picnic is 4 to 5. The total number of people at the picnic is 27. How many adults and children are at the picnic? Include steps.

Answers

There are 12 children and 15 adults at the picnic.

Add together the ratios 4 and 5 and divide the amount of people by that number (so 27 divided by 9)

You then get 3. So then multiply both sides of your ratio by 3. (4:5 ----> 12:15)

Hope this helps a little.

PLEASE ANSWER ASAP AND EXPLAIN!!!!!!!!!!!At an aquarium, researchers are preparing a mixture of salt water. The desired ratio is 90 grams of salt per liter of water.•
1 ounce = 28.35 grams• 1 gallon = 3.8 liters

What is the ratio in ounces per gallon?
A. 0.8 ounce per gallon
B. 3.2 ounces per gallon
C. 12.1 ounces per gallon
D. 23.7 ounces per gallon