Which simplified expression represents the area of the parallelogram

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

3x + 4y = 5 x- 3y = -7 solve by substitution