The function f(x) varies directly with x and f(x)= 90 when x=30. What is f(x) when x=6?
1 Answer
Jun 21, 2018
Explanation:
#"the statement is "f(x)propx#
#"to convert to an equation multiply by k the constant"#
#"of variation"#
#f(x)=kx#
#"to find k use the given condition"#
#f(x)=90" when "x=30#
#f(x)=kxrArrk=(f(x))/x=90/30=3#
#"equation is " color(red)(bar(ul(|color(white)(2/2)color(black)(f(x)=3x)color(white)(2/2)|)))#
#"when "x=6" then"#
#f(x)=3xx6=18#