Find the value of y for a given value of x, if y varies directly with x. If y = 2.52 when x = 8.4, what is y when x = 2.7? (1 p

Question

3 years ago

6

oint) 9 –9 0.81 –0.81

2 answers:

Levart [38] · Answer 1 · 2021-12-16T16:04:19+03:00

we know that

A relationship between two variables, x, and y, represent a direct variation if it can be expressed in the form $(y/x)=k\ or\ y=kx$

in this problem we have

$y = 2.52\ when\ x = 8.4$

so

Find the value of the constant k

$(y/x)=k$

substitute

$k=(2.52/8.4)$

$k=0.3$

the equation is equal to

$y=0.3x$

Find the value of y when $x=2.7$

substitute the value of x in the equation

$y=0.3*2.7$

$y=0.81$

therefore

the answer is

$0.81$

Gwar [14] · Answer 2 · 2021-12-16T17:20:29+03:00

Gwar [14]3 years ago

4 0

8.4/2.52 = 2.7/y
cross multiply:
8.4y = 6.80
y = 6.80/8.4 = choice (D)