Please solve all correctly

Section 3.7 Solving Systems of Linear Equations by Using Matrices CLASSROOM ACTIVITY 3.7A CLASSROOM ACTIVITY 3.6C Solve the system. If the system does not have one unique solution. also state the 1. Give an example of a 4 x 2 matrix. number of solutions and whether the system is inconsistent or the equations are dependent. 3x-9y +37 = 3 2x- y-22 -2 2. Give an example of a 2 x 4 matrix. 3. Give an example of a square matrix. 2. Solve the system. If the system does not have one unique solution, also state the 4. Give an example of a row matrix. number of solutions and whether the system is inconsistent or the equations are dependent. 4x + 62 =6 8x-9y+ 15z=9 4.x-3y+ 72=5 5. Give an example of a column matrix. Section 3.6 Systems of Linear Equations in Three Variables and Applications CLASSROOM ACTIVITY 3.6B CLASSROOM ACTIVITY 3.6A The average of Randall's three test grades in Economics is 92%. His first test was 6 points higher than his second test. His third test was 3 points lower than the first test. What were his test scores? 1. Given the system: -5x+ 3y+2z=1 Let x represent: xty+ z=7 2x - y+ z =7 Let y represent: a. Which variable would you prefer to eliminate? b. Choose two equations to pair up to eliminate the variable. Write the resulting equation here: Let z represent: Write a system of algebraic equations and solve: C. Choose a different pair of equations and eliminate the same variable. Write the resulting equation here: d. Solve the system of equations from parts (b) and (c). e. Substitute the solution found in part (d) into one of the original equations. Write the solution set. Interpret your answer using a complete sentence