Question

the value of y varies directly with x, and y=4 when x=-10. find y when x= 35.

Answer 1

y varies directly with x
y=kx
10=k(15)
k=10/15
y=(10/15)x
when x=6
y=(10/15)(6)=60/15=4

x varies inversely as y
x=k/y
2=k/8
k=16
x=16/y
when y=17
x=16/17