The graph of a system of two linear equations has no solution. what is true about the lines?
a. the lines are perpendicular
b. the lines have the same slope, but different intercepts.
c. the lines have the same intercept, but different slopes.
d. the lines are on top of each other.

The life (in hours) of a magnetic resonance imagining machine (mri) is modeled by a weibull distribution with parameters β = 2 and δ = 370 hours. (a) determine the mean life of the mri. (round your answer to 2 decimal ) determine the variance of the life of the mri. (round your answer to 1 decimal ) what is the probability that the mri fails before 250 hours? (round your answer to 4 decimal places.)