janelle has $75. She buys jeans that are discounted 30% and then uses an in-store coupon for $10 off the discounted price. After
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Let x be the number of buses, and y the number of cars.
We can solve for y in the first equation to get:
Now we can replace 21-x in our second equation, and solve for x:
We can conclude that 9 buses were needed for the trip.
We can solve for y in the first equation to get:
Now we can replace 21-x in our second equation, and solve for x:
We can conclude that 9 buses were needed for the trip.