Answer:
It is necessary four parameters.
Step-by-step explanation:
Since the augmented matrix of the consistent system has rank equal to three then the number of free variables is (number of unknows)-rank then there are 7-3=4 free variables. This means that are necessary four parameter to specify all solutions.
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Answer: it is definitely c. y=3x+2
Step-by-step explanation: solve the first equation and then plug in
Use the Pythagorean theorem:
Answer: C. 7.5