Andre’s school orders some new supplies for the chemistry lab. The online store shows a pack of 10 test tubes costs $4 less than
a set of nested beakers. In order to fully equip the lab, the school orders 12 sets of beakers and 8 packs of test tubes. 1. Write an equation that shows the cost of a pack of test tubes, t, in terms of the cost of a set of beakers, b.
2. The school office receives a bill for the supplies in the amount of $348. Write an equation with t and b that describes this situation.
3. Since t is in terms of b from the first equation, this expression can be substituted into the second equation where t appears. Write an equation that shows this substitution.
4. Solve the equation for b
5. How much did the school pay for a set of beakers? $
6. How much did the school pay for a pack of test tubes? $
Answer: The equation of a circle with center (h,k) and radius r is given by (x−h)2+(y−k)2=r2 . For a circle centered at the origin, this becomes the more familiar equation x2+y2=r2
