Answer:
this question doesnt have a solution it makes no sense
Step-by-step explanation:
Answer:
A
Step-by-step explanation:
Those two lines are the same. If you divide the second equation by 2, you will end up with the first equation. A system of linear equations cannot have two of the same line.
we have

we know that

therefore
<u>the answer is</u>
The expression equivalent is 
(10x + 4) + (5x-4) ≈ 180
solve for x and you get x≈12
plug 12 in to 5x-4 and you get 56
They are because 2.7 squared + 3.6 squared = 4.5 squared (=20.25)
Pythagoras Theorem is that a squared + b squared = c squared
So the 2 smallest numbers squared will equal the larger one squared if it is a pythagoreom triple