Somebody hep to solve qno (d)pls​

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?

Solve 2x+y=3 x+y=5 in substitution method

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9