Use the system of equations to answer the following questions. x = y x + y = 4. Part A Solve the system of equations using a graphing method. x=y

Part B Solve the system of equations using the substitution method.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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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