2-the following equations are given:
equation #1: 4x + z + y = 8
equation #2: 5y - x = -7
equation #3: 3z + 3x - 2y = 15
equation #4: 4x + 5y - 2z = -3
a. is it possible to solve for any of the variables using only equation #1 and equation #2? explain your answer. if possible, solve for the variables using only equations #1 and #2.
b. is it possible to solve for any of the variables using only equation #1, equation #2, and equation #3? explain your answer. if possible, solve for the variables using only equations #1, #2, and #3.
c. if you found solutions in part b, do these solutions also hold for equation #4?