If 6x+3y=−1 and
5x+y=8 are true equations, what would be the value of
−x−2y?

  9

x = 2.778

y = -5.889

-x -2y

= -2.778 - 2(-5.889)

= 9

i can't read the graph

step-by-step explanation:

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.