Question

If y varies directly as​ x, and yequals=77 when xequals=66​, find y when xequals=1212.

Answer 1

if y varies directly as x ⇒y/x=k
when y=77 and x=66⇒ y/x=77/66=7/6

when x=1212 ⇒ y/1212=7/6
y=1212*7/6=202*7
y=1414