If 9x+2y^2−3z^2=132 and 9y−2y^2+3z^2=867, then x-y =

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

Which one is true about the hexagons ?

Which expression is equivalent to -12(3x-3/4)