Question

If y varies inversely as x and y=10 when x= 5, find y when x= 5

Answer 1

• x = 10 when y = 5

Explanation:

Note: y = 10 when x = 5 is already given, must be find x for y = 5.

y = k/x is the formula, using the given values finding the constant:

• 10 = k/5
• k = 10*5
• k = 50

So for y=5 we have:

• 5 = 50/x
• x = 50/5
• x = 10