Question

Y varies inversely with x. When x = 3 then y = 5. Find the value of x when y = 21

Answer 1

Answer:

• y=1/x
• y=k/x
• k=yx
• given x=3,y=5
• k=5×3=15
• when y=21
• x=k/y
• x=15/21=0.7143ans