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Text Box: INSTRUCTIONS for Ax + By = C form: ENTER numbers for A, B, and C into Cells B16, C16, D16, B17, C17, and D17, respectively. Now enter the values from cells E16, F16, E17, and F17 into Cells C4, D4, C5, and D5 for the slope and y-intercept of L1 and L2.