A pencil costs $3.50 and a pen costs $6.70. Jessica bought m pens. She also bought 4 fewer pencils than pens. Write an algebraic expression for the total amount she spent and solve the expression.

To answer the equation first, let x be the number of pens. With this representation, the number of pencils she bought would be x - 4. The total amount she would have to spent for all the items is,

T = 6.70x + 3.5 (x - 4)