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Multiply the top equation by +7

Step-by-step explanation:

usually I would think that the first step would be multiply the top equation by -2, but that's not an option

A doesn't work, because it just wouldn't help. B can't work either, because we're trying to get rid of an x or y term.

how is that middle school

step-by-step explanation:

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft