For last question , Morally logically i do 18000 - 10500 = the amount of money lost after 5 years (7500/5years) . Then i divide 7500 by 5 = $1500 / year. then 18000 / 1500 = 12 years
Ans for the last question: Set up points: (0,18000) (5,10500) and (?,0). Solve for the gradient. (10500-18000)/(5-0)= -1500. Now sub it in the linear equation y=-1500t+18000. Make y=0 and solve for t. Therefore the final ans is t=12 years.
For last question , Morally logically i do 18000 - 10500 = the amount of money lost after 5 years (7500/5years) . Then i divide 7500 by 5 = $1500 / year. then 18000 / 1500 = 12 years
thats smart
It’s tight
Hi! Why are you doing y1-y2/x1-x2? In the IB formula booklet they do: y2-y1/x2-x1
Dumbass it doesnt matter lol. I take IB as well
@@simonnn7218 that's not very nice, they were just asking a question you don't need to be rude
@@taram2746 k. Commented that long time ago
@Not Shadow yes with great internet comes great responsibilty
its the same thing
Most helpful video one youtube, thank you I wish my teacher was this way!!
Great explanation! Now understood every single thing about this concept ..,,thanks Aton
Also, you can use with arithmetic sequence method just like when you find the unknown arithmetic sequence through given two known terms.
Why is it y1-y2 and x1-x2 , isn't it y2-y1 and x2-x1???
it doesn't matter
Yes it does matter. It's Y2-Y1 and X2-X1.
+Hannah Vann no it doesnt. comes out to the same thing no matter how you apply it. it has to follow the same set from top to bottom though
+Hannah Vann it can be y2-y1 over x2-x1 or y1-y2 over x1-x2.
@@jeremyfischer3867 By that logic, in an expression such as 4÷6x7, I can multiply 6 and 7 first and still get the correct answer.
Ans for the last question: Set up points: (0,18000) (5,10500) and (?,0). Solve for the gradient. (10500-18000)/(5-0)= -1500. Now sub it in the linear equation y=-1500t+18000. Make y=0 and solve for t. Therefore the final ans is t=12 years.
i thought the slope equation was y2-y1/x2-x1 ? so wouldn't it be 5-0 instead of 0-5? I am so confused now
why we can't apply y=mx+b in the last question? :/
you can. i did that
@@sbeity bro really replied 3 years later also if anyone wants to know you are looking for x and not y since we already know y=0
none of this means anything to a person without the requisite background- point slope formula.
Wowwwwwwwwwwwww soooooo helpfullllllllll
This was pretty helpful!
girl aint even show me if i was right
12 years
x=15 so, after 15 years
ma'am your voice is really attractive and it makes it hard for me to learn
Then watch other videos about the same subject then.
valid comment fr
Speak up please.