Solve the following by the method of your choice, and show your work: 7. x+2y=-4
-3x-2y=-4

8. 4x+y=2
y=x-3

9. 2x-3y=7
4x+y=-7

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3