15% = 0.15
multiply the bill ( 42.00) by 0.15 for the amount of tip
42.00 * 0.15 = 6.30
the tip = $6.30
Answer:
The answer is both a and b
1. y = -2/3x + 2
2. y = 2/4x + -3
3. y = 1x -1
