(1.2: Solving linear equations) Consider the following linear system withaandbunknown non-zero constants. x1−3x2+x3=42x1−8x3=−2−6x1+ 6x2+ax3=b(a) For what values ofaandbdoes the system have infinitely many solutions?(b) Given an example ofaandbwhere the system has exactly one solution.(c) Give an example ofaandbfor which the system has no solutions.