Jn Exercises 15 and 16, use the following information. .05 a5 A piggy bank contains only nickels and quarters. The total value in the bank s $3.80. 15. Write an equation in standard form that models the possible combinations of nickels and quarters in the piggy bank. 6. List two of these possible combinations. J. Write an equation of the line that passes through the point (-4, -1) and is (a) parallel to and (b) perpendicular to the line 2x + 7y = 14. Exercises 18-22, use the table.

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