120 because 60 times two is 120 and six times two is twelve

By the quadratic formula,

Then


Multiply numerator and denominator by the denominator's conjugate:

<span>When a = 3 and b ≠ 5, the system will be inconsistent because the lines will be parallel. When a = 3 and b = 5, the system will be consistent and dependent because they represent the same line.</span>