Mai is given these two systems of linear equations to solve: System 1: 5x + y = 13
System 2: 20x + 4y = 64
50 + y = 13
20x = 52 – 4y
She analyzed them for a moment, and then-without graphing
the equations-said, "I got it! One of the systems has no solution
and the other has infinitely many solutions!" Mai is right!
Which system has no solution and which one has many
solutions? Explain or show how you know (without graphing the
equations)

pleaseee i need help with this

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.