Dimensions of a Matrix

The Number of columns in A must be equal to the number of rows in B to be multiplied. 

1 X 3

3 X 3

3 X 3

2 X 3

Error Analysis (:

The inputs increase by 5. The output values represent the table 2x+9

(1,2) is the solution of the 5x-7 but not a solution to x+4y

For problem 22, The inequality should be a dotted line because it's less than without an equal sign. For problem 23, the shading should be above the line as compared to the picture which is shaded below.

For these set of inequalities, the shading is correct but the lines have to be dotted instead of straight. The line should be straight because the sign is less than/greater than or equal to.

Linear Inequalities [ :

Solving Linear Equations (: