Question

will fan and give medal!!!
determine whether y varies directly with x. if so, find the constant of variation k.
3y=-7x-18

Answer 1

for direct variation equation should of tjis type
y=cx
where c is constant of vavriation

Answer 2

i dont understand at all D: I'm sorry. :/

Answer 3

like if y vary than value of x should vary in a proportion

Answer 4

oooh, alright. so pretty much much 1/3=2/6 type of thing?

Answer 5

so would i have to solve the equation twice. 1 for y and 1 for x?

Answer 6

only difference is it will nultiplied with wome contant
like y=2x
x=1 than y=2
x=2 than y= 4
x=9 than y=18
hope you got it

Answer 7

alright, can you explain how to solve the equation part? I'm sorry.

Answer 8

no no
like x have value 1
than put value of x and get value of y

Answer 9

3y=-7x-18
like x= 0
put it in equation
3y=-7*0-18
3y=-18
y=-6

Answer 10

but in it you have to -18 so it is not directly proportional

Answer 11

so the x would have to equal the -18? or? haha, I'm sorry, I'm really confused

Answer 12

loll....here we can put any value for x WHATEVER YOU WANT
but after putting value of x
-7*x -18
you have to subtract 18 from the value obtained

Answer 13

llet x=2
y=-7*2-18
y=-14-18=-32
for directly proportionality
nothing should be added or subtracted from x term but here 18 is subtracted so it is not directly vary

Answer 14

alright, so what your saying is when another number is subtracted from it, it does not directly vary?

Answer 15

yeah subtracted or added

Answer 16

y=2x
y=100x
y=x/478748
y=x/677
all vary directly

Answer 17

but y=2x+3
y=100x-20
not vary directly

Answer 18

oooh, alright! that makes more sense haha. so the answer would be no?

Answer 19

yepppppppppppppp

Answer 20

thank you so much!

Answer 21

welcm lol :)