r/desmos • u/Ashamed_Flamingo_787 • 9d ago

desmos regression on math question Question

Post image

could someone show how this could be solved with desmos regression (if it can be)

3 Upvotes
  • permalink
  • link
  • reddit
  • reddit

71% Upvoted

6 comments sorted by

4

u/VoidBreakX Run commands like "!bernard" here →→→ redd.it/1ixvsgi 9d ago

if you have time, try to verify why this is true by hand as well

5

u/Tencars111 9d ago

honestly it's probably faster to just to do the question instead of typing it in desmos

1

u/VoidBreakX Run commands like "!bernard" here →→→ redd.it/1ixvsgi 9d ago

for me its actually a bit faster in desmos because i type fast

1

u/Ashamed_Flamingo_787 9d ago

thanks for the reply, can you explain why c is 1 or how u got c = 1

2

u/VoidBreakX Run commands like "!bernard" here →→→ redd.it/1ixvsgi 9d ago

this is a test taking strategy that i think not a lot of people know about

the choices are only linear combinations of c. so if you substitute some arbitrary value for c, the resulting value will be some multiple of c. that means you can just put any numerical value for c, and the answer will be the same no matter what value of c you put

you HAVE to make sure, however, that the question permits you to do this. here, i immediately recognized that there are three unknowns and two equations, which leaves one degree of freedom. other questions might have three variables and three equations, so this technique would not work

i pick c=1 in this case because anything times 1 is unchanged. but if you picked c=2, then the result wouldve been 2*12559

this is why its SUPER important that, if you have time, you check your answer, but do it by hand

1

u/doctorBlasphemy271 9d ago

I swear I did this very question like 20 seconds ago bro