What is the slope of a line perpendicular to the line whose equation is x-y=6

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

In angle pqr find the measure of

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.