Answer:
C. 
Step-by-step explanation:
Given:

Add the two equations, we get

Therefore, the correct option is option C.
Answer:
Sure, Help you with what?
Step-by-step explanation:
Let me know :)
Have an AWESOME Friday <3
Related angle is 45 degrees, set up a triangle and use exact trig values to solve for x and y, then rationalise the denominators
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To solve for 2 variables, you need 2 equations. The best you could do with only one equation would be to find 'a' in terms of 'b'. Just looking it over and without putting pen to paper, it looks to me like one possible solution is [ a = 4, b = 0 ].