You would measure the length of a segment with a straightedge because it is free from curves and can help measure a segment because it is straight.
Answer:
the answer is 69.3
Step-by-step explanation:
Using substitution:
first you have to express one variable in terms of the other, in this we can express y in terms of x:

Since both expressions are equal to y, you have to equal both expressions like this:

Now you can solve the equation:

Knowing x=10, you can use any of the expressions we found before to find y. In this case I'm going to use y= -x+9 because it's simpler but boy should give you the same result

So, the answer is x=10 and y=-1
180- 44= 136 = x
90-57=33 = y
107 - 27 = 80 = x
P = 57