If a dozen eggs cost $ 1.35what is the unit cost

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

The polygon tool to draw a rectangle with a length of 5 units and a height of 3 units. one of the sides of the rectangle falls on line ab , and the rectangle has a vertex of a. each segment on the grid represents 1 unit.

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary