Simplify each expression 10x+2x-12x
2 answers:
You might be interested in
Answer:
Option 2nd is correct
y = 20
Step-by-step explanation:
Joint variation says that:
if and
⇒
then;
equation is in the form of :
where, k is the constant of variation.
As per the statement:
the quantity y varies directly as x and inversely as z.
then by definition we have;
.....[1]
When x = 10, z = 4 and y = 15
Substitute these in [1] we have;
⇒
Divide both sides by 2.5 we have;
6 = k
or
k = 6
then;
we have to find y, when x = 20 and z = 6
Substitute these we have;
⇒y = 20
Therefore, the value of y = 20