Choosing a four or a black card out of a standard deck of cards is Mutually exclusive or Not Mutually exclusive/

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

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

72 the length of a side of a triangle is 36. a line parallel to that side divides the triangle into two parts of equal area. find the length of the segment determined by the points of intersection between the line and the other two sides of the triangle.