Asap i will mark is you as brilliant only these three!

What is the solution to the system of equations? y=1.5-3 y=-x

Solve 2x − 1 = 11 for x using the change of base formula log base b of y equals log y over log b.

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.