The variables x=5/2 and y=5/4 varies directly. How do you write an equation that relates the variables and find x when y=-5?

1 Answer
Sep 7, 2017

#x=-10#

Explanation:

#"the initial statement is "ypropx#

#"to convert to an equation multiply by k the constant"#
#"of variation"#

#rArry=kx#

#"to find k use the given condition"#

#x=5/2" and "y=5/4#

#y=kxrArrk=y/x=5/4xx2/5=1/2#

#"equation is " color(red)(bar(ul(|color(white)(2/2)color(black)(y=x/2)color(white)(2/2)|)))#

#"when "y=-5#

#x=2xx-5=-10#