12(3x)=12 what does x equal

Will give brainliest if you answer question correct

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

State if the two triangles are congruent. if they are, state how you know?