Book Maths Puzzle Blood Relations

After seeing Danielle's recent photo from her elementary school, everyone at the Farell family gathering started looking at old family pictures. Tony commented that when he was the

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Book Other Question

YOU OWN A COMPUTER STORE SELLING TWO TYPES OF LASER PRINTER. tHE FIRST TYPE A, HAS A COST OF $165 AND YOU MAKE A PROFIT OF $45 ON EACH ONR. THE SECOND TYPE B, HAS A COST OF $110 AND YOU MAKE A PROFIT OF $30 ON EACH ONE. YOU EXPECT TO SELL AT LEAST 100 LASER PRINTERS THIS MONTH AND YOU NEED TO MAKE AT LEAST $3450 PROFIT ON THEM.

A) HOW MANY OF EACH MODEL SHOULD YOU ORDER IF YOU WANT TO MINIMUM THE COST?

B) WHAT IS THE MINIMUM COST? Please help me with a step by step process for solving linear equations. My problem is:
x + y = 4
x - y = 5
I don\'t know what the first step should be.