Write an equation that says the length of the green line is equal to the black line? Alright.
So first step, put an equal sign down. You’re writing an equivalent equation.
=
Next write 27 on one side, that’s the green line.
27 =
Now write 16 on the opposite side because that’s part of the black line.
27 = 16
Now write x for the unknown length of the black line on the same side as 16 since they’re both the black line. But separate them with an addition sign because 16 plus x equals the total length of the black line.
27 = 16 + x
That’s your equation!
Next part is combine like terms, as stated in the instruction.
Simply subtract 16 to both sides to get x alone.
26-16=11
11 = x
The unknown variable/length is 11.