Step-by-step explanation:
2x - 9y = 14
x = -6y + 7
2(-6y + 7) + 9y= 14
-12y + 14 + 9y= 14
-3y + 14 = 14
-3y = 0
y = 0
x = 7
Answer:
15
100 laps
100 divided by 20 Is 5
3 x 5 is 15
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