Uh I need help with this I cant figure it out

Which of the following is the equation of a line that passes through the point (1,4) and is parallel to the x-axis a. y=1 b. y=4 c. x=1 d. x=4

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Identify the values hat create ordered pairs that are solutions to the equation 3x-5y=20