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How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Jamie went to home depot. she bought 25 bags of soil that cost $9 per bag. she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each. she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

How do you solving the solution of each system using elimination?