Consider the linear system: 2x1 + ax2 -x1-3x2 = -21 = 14 for what value of a Cramer's rule can not be used to solve this system? Select one: O a=-8 ○ a = 9 ○ a = -6 ○ a=8 ○ a=6

Solve the system 2x6y+6z=462x3y=31.

Explain the steps for solving a system of equations using Cramer’s rule.

Use the system of three equations in three variables to solve each problem. Work schedules A college student earns 198.50 per week working three part-time jobs. Half of his 30-hour work week is spent cooking hamburgers at a fast-food chain, earning 5.70 per hour. In addition, the student earns 6.30 per hour doing janitorial work. How many hours per week does the student work at each job