The system of equations can be solved using linear combination to eliminate one of the variables.
 2x − y = −4 → 10x − 5y = −20
 3x + 5y = 59 → 3x + 5y = 59
 13x = 39
 Which equation can replace 3x + 5y = 59 in the original system and still produce the same solution?
 2x – y = –4
 10x – 5y = –20
 7x = 39
 13x = 39