A submarine is descending to examine the seafloor 2,100 feet below the surface. It takes the submarine 2 hours to make this descent. Which equation represents the relationship between the submarine's elevation and time, where y is the elevation and x is the time in hours?

y=mx+b

step-by-step explanation:

m slope, b y-intercept

the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844

if im not mistaking its

step-by-step explanation:  

yes

step-by-step explanation:

so of course you want to start by plugging the 5 in which goes to 7(5)+3(5)=50 because 7*5=35 and 3*5=15 and then add them together, then plug in the 5 to the other equation as well 9(5)+5=50 because 9*5= 45 and then add 5 and so yes they are equivalent.