What is the most efficient first step to isolate the variable term on one side of this equation?
-9x = -4x + 5
Subtract 5 from both sides.
Add 5 to both sides.
Subtract 9x from both sides.
Add 4x to both sides.

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

first one because it can't have a fraction in it

step-by-step explanation: