A concert promoter needs to make $43,100 from the sale of 1780 tickets. The promoter charges $20 for some tickets and $35 for the others. Let x represent the number of $20 tickets and y represent the number of $35 tickets. (a) Write an equation that states that the sum of the tickets sold is 1780.       (b) Write a formula for how much money is received from the sale of $20 tickets? $        (c) Write a formula for how much money is received from the sale of $35 tickets? $        (d) Write an equation that states that the total amount received from the sale is $43,100.       (e) Solve the equations simultaneously to find how many tickets of each type must be sold to yield the $43,100. x  =    y  =

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Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.