System of equations with no solution

choose all of the system of equations which have no solution.

x + 2y = 10 and 2y = 6 + 5x
x = 8 − y and y = 6 + 5x
3x + 2y = 5 and 2y = 6 − 3x
3x = 2 − 4y and 4y = 7 − 3x

What is the greatest common factor of 8 and 36

which  best  describes the transformation from the graph of  f(x) =  x2  to the graph of  f(x) = (x  – 3)2  – 1?   left 3 units, down 1 unitleft 3 units, up 1 unitright 3 units, down 1 unit  right 3 units, up 1 unit

Which best explains why this triangle is or is not a right triangle?