2. Which of the following could be appropriate values for an equation to be in Standard Form (Ax + By = C)? O A= -6, B = 8 and C = 3
O A = , B = į and C = 0
O A = 4, B = 0 and C = 9
O A = 4, B= 1 and C = 0

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4