The ordered pairs (-1,2) and (4,y) are for the same direct variation, how do you find each missing value?

1 Answer
Jim G.
May 6, 2018

#(4,y)to(4,-8)#

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"#

#(-1,2)tox=-1,y=2#

#y=kxrArrk=y/x=2/(-1)=-2#

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

#"when "x=4" then"#

#y=-2xx-4=-8#

#rArr(4,y)to(4,-8)#

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