A varies jointly as b and c. Find when b = 7 and c = 9, if the constant is the variation is 3. A) 189 B) 7/3 < Question A varies jointly as b and c. Find when b = 7 and c = 9, if the constant is the variation is 3. A) 189 B) 7/3 C) 21 in progress 0 All 1 month 2022-04-08T04:46:10+00:00 2022-04-08T04:46:10+00:00 0 Answers 0

## Answers ( 2 )

Answer:Option A is correct

Value of A is, 189Step-by-step explanation:Joint variation states:A varies jointly as b and c.

u21d2[tex]A propto b[/tex] and [tex]A propto c[/tex]

u21d2[tex]A propto bc[/tex]

then the equation is in the form of:[tex]A = k cdot bc[/tex]

where, k is the constant of variation.

As per the statement:A varies jointly as b and c.

u21d2[tex]A = k cdot bc[/tex] ….[1]

To find A .Substitute the given values b = 7 , c = 9 and k = 3 in [1]

then;

[tex]A = 3 cdot 7 cdot 9 = 21 cdot 9 = 189[/tex]

Therefore, the value of A is, 189189 would be correct!