Given y varies directly with x, write the equation of the line when x=3 and y=-12?

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Answer 1 · 2016-11-20T21:49:21

#y = -4x#

If y and x are in direct proportion, then they are linked by a constant.

#ypropx" "larr# write the proportion

#y = kx" "larr# make an equation with a constant

#y/x = k#

#-12/3 = k" "larr# use the given values to find k.

#k = -4#

Now we can write an equation:

#y = -4x#