Point of intersection for two lines

A). First replace y in the first equation by the right hand side of the second equation:

 

4x - 1 = 2x + 3

subtract 2x from both sides: 2x - 1 = 3

add 1 to both sides: 2x = 4

divide both sides by 2:  x = 2

put this into the first equation: y = 2*2 + 3 or y = 7

hence the point of intersection is (2, 7)

 

B) You have only supplied one equation

 

C) Try using the same approach I used in A) above.