Solve the system of equations by substitution.
4x−3y=18
x+2y=−1

Is this a polynomial function? i need to know asap

M∠abc=138° and m∠def=31° . which statement is true about ∠abc and ∠def ? a: the angles are neither complementary nor supplementary. b: the angles are complementary. c: the angles are supplementary.

Let y = and z = . translate "z less than y" into an algebraic expression, and solve it.