If x and y vary directly, and x = 12 when y = 3, what will be the value of x when y = 9? 36 27 4.5

100

The value of x when y = 9 is 36

Solution:

Given that, x and y vary directly,  

And x = 12 when y = 3,  

We have to find what will be the value of x when y = 9

Now from the given information,

x = cy ---- eqn 1

where "c" is the proportionality constant

Now, substitute x = 12 and y = 3 in (1)

12 = c(4)  

c = 3

Then, (1) ⇒ x = 4y

So, when y = 9 ⇒ x = 4(9) ⇒ x = 36

Hence, x value is 36 when y value is 9, so 1st option is correct

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

ask for details followreport by buttfacelily 2 minutes ago

answers

rauschg

rauschg · hand

know the answer? add it here!

step-by-step explanation:

a

step-by-step explanation: