What is the sign of 3.456 + \left(-3.456\right)3.456+(−3.456)3, point, 456, plus, left parenthesis, minus, 3, point, 456, right parenthesis? HEL PLSSS :((

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]