Write the system of equations for the matrix. Then use back-substitution to find its solution. 
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Q40: Solve using the elimination method. If the
Q41: Solve the system of inequalities by graphing
Q42: Determine the size of the matrix and
Q43: Solve the system of inequalities by graphing
Q44: Solve the system of inequalities by graphing
Q46: Determine whether the ordered pairs given are
Q47: Solve the system of inequalities by graphing
Q48: Determine the size of the matrix and
Q49: Solve the system of inequalities by graphing
Q50: Perform the indicated row operation, then write
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