12. The first step in solving the equation 10x-3=30 is which of the following? A. Subtract 3 from 30 using the subtraction property of equality.

B. Add 3 to 30 using the addition property of equality.

C. Divide 30 by 10 using the division property of equality.

D. Subtract 27 from both sides using the subtraction property of equality.

B.) Add 3 to 30 using the addition property of equality.

Step-by-step explanation:

This is because in 10x-3=30, you need to get rid of the "-3" before you divide the 10 out of "10x" to get "x" alone.

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)