Question

If y varies jointly as x and z, and y = 20, x = 2, and z = 5, then find k, the constant of variation.PLEASE HELP!!!

Answer 1

Is it 2?

Answer 2

@jim_thompson5910

Answer 3

y = k*x*z

y = 2*x*z ... assume k = 2

y = 2*2*5 ... plug in x = 2, z = 5

y = 20

so this confirms that k = 2

Answer 4

Thank you so much:) I have another one:
What is the least common denominator of the expression a/5+a/x+5?
@jim_thompson5910

Answer 5

Isn't it 5(x+5)?

Answer 6

that is correct assuming you're dealing with

\[\Large \frac{a}{5} + \frac{a}{x+5}\]