
solve for "k", to find the "constant of variation",
then plug it back in the y = kx, to get the equation
now
what's is y when x = -1?
well, just plug that in the equation with the found "k" value,
to get "y" :)
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From here, it looks like all three sides of the right triangle are missing. I don't see any of them in the question.
1). not a -27
2). -8x = -96 (x = 12)
3). y = -150