. On a recent shopping trip, you see a sale advertising 5 pairs of socks and 2 pairs of shoes for $100. Write an equation using x to represent the cost of socks and y to represent the cost of shoes.
1.2x + 5y = 100
2.5x + 2y = 100
3.50x + 20y = 100
4.20x + 50y = 100
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