Please answer both questions, not just one. And both must be detailed answers with an example each if possible 1. If the slope or y-intercept of one equation in the system changes, what effect does it have on the linear system?

2.You are comparing the rate of renting two halls. The point of intersection is (20, 400). What could the point of intersection mean in context to this question?

Statements reasons 1. ab ≅ cd; ad ≅ bc 1. given 2. ac ≅ ac 2. reflexive property 3. △adc ≅ △cba 3. ? 4. ∠dac ≅ ∠bca; ∠acd ≅ ∠cab 4. cpctc 5. ∠dac and ∠bca are alt. int. ∠s; ∠acd and ∠cab are alt. int. ∠s 5. definition of alternate interior angles 6. ab ∥ cd; ad ∥ bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?