Help me pls I dont get this

Explain how you do each step what term makes it inconsistent y=2x - 4 ?

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 jame pay at the end?

What does the sign of the slope tell you about a line?