Question

Find an equation of variation in which y varies jointly as x and z. y = 7 when x = 7 and z = 1
A. y=x/z
B. y=xz

Answer 1

@Skaematik what about this?

Answer 2

When we say z is jointly proportional to a set of variables, it means that z is directly proportional to each variable taken one at a time

It means they are DIRECTLY PROPORTIONAL. So the answer is

Answer 3

y=xz?

Answer 4

@Skaematik

Answer 5

yes

Answer 6

thanks! can you help me with one more please? @Skaematik

Answer 7

sure