Answer:
Change 4020 to 4000 + 25.
Then use the distributive property.
4025 * 5 = (4000 + 25) * 5 = 4000 * 5 + 25 * 5 = 20,000 + 125 = 20,125
The solution point where the two lines intersect is (-2,0).
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$3.18 when the tax is applied to each bottle separately or at the end of the bill.
17 + 5shirts = 42
5shirts = 42-17 = 25
1shirt = 25/5 = 5
A shirt costs £5.
3*5 + 1hat = 17
15 + 1hat = 17
1hat = 2
A hat costs £2