If ∠A is a complementary angle of ∠B and ∠C is a complementary angle of ∠B, then which of the following statements is true? A. ∠A ≅ ∠B
B. ∠B ≅ ∠C
C. ∠A + ∠C ≅ ∠B
D. ∠A ≅ ∠C

so mark-up is 0.4 multiplied by 180 = 72

x=-2

step-by-step explanation:

i began by flipping the problem to give me x= on the left (keeps it clearer for me).   so my problem simply became 10x-3=4x-6.  

1)   subtract 4x from the right side, which equals 0.   you do the same to the left of the equal as the right; therefore, subtract 4x from 10x, leaving 6x on the left.

              10x-3=4x-6   :   4x-4x on the right leaves only the -6        

2)             6x-3= 0-6 :    

                6x+3=   -6

3) divide