Answer the True or False Mathematics Questions

True or False

If you think the statement is true, then show that it is true. On the other hand, if you think the statement is false, then give an example that disproves the statement. For example, the statement “If A and B are matrices of the same order, then A – B = B – A” is false and an example that disproves it is

20140303025614equation.png

For 

20140303025644equation1.png

while 

20140303025707equation2.png

Such an example is called a counterexample.

  1. True or false: A system comprising two linear equations in two variables has a unique solution if and only if the straight lines represented by the equations are nonparallel.
  2. True or false: Suppose the straight lines represented by a system of two linear equations in two variables are parallel to each other. Then the system has infinitely many solutions.
  3. True or false: If A and B are matrices of the same order, then 20140303025750untitled.png
  4. True or false: If A and B are matrices such that AB and BA are both defined, then A and B must be square matrices.
  5. True or false: If A is a square matrix with inverse 20140303025844untitled1.pngand c is a nonzero real number, then

    20140303025927untitled2.png

  6. True or false: If AX = B is a system of n linear equations in n unknowns and 20140303030012untitled3.png  does not exist, then AX = B does not have a unique solution.

 
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