<h3>Explanation:</h3>
1. PQ║TS, PQ ≅ TS, PT and QS are transversals to the parallel lines . . . given
2. ∠P ≅ ∠T . . . alternate interior angles at PT
3. ∠Q ≅ ∠S . . . alternate interior angles at QS
4. ΔPQR ≅ ΔTSR . . . ASA postulate
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You can use any pair of angles together with the sides PQ and TS. If you use the vertical angles and one of ∠T or ∠S, then you must invoke the AAS postulate for congruence, as the side is not between the two angles.
 
        
        
        
Answer:
Step-by-step explanation:
 
        
             
        
        
        
We are given 
First equation:

we can use formula 

slope is m=1
y-intercept is b=-1
Second equation:

we can use formula 

slope is m=-2
y-intercept is b=5
Graph:
We can see that 
both curves intersect at (2,1)
so, solution is x=2 and y=1.................Answer
 
        
             
        
        
        
2 (-18 - 6) = -48
By order of operations (PEDMAS)  the parentheses are calculated first.