Find an equation of the vertical line that passes through the point (4,-2).

x = 4 is the equation

The equation of a vertical line , parallel to the y-axis is

x = c where c is the value of the x-coordinate the line passes through

the line passes through (4 , - 2)

Thus equation is x = 4

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b