Write an equation that shows the cost of a pack of test tubes, , in terms of the cost of a set of beakers, .

Type the equation:

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Step-by-step explanation:

a set of beakers cost $19

A pack of test tubes cost $15

Step-by-step explanation:

Let t represent the cost of a pack of test tubes.

Let b represent the cost of a set of beakers.

The online store shows a pack of 10 test tubes costs $4 less than a set of beakers.

This means that t = b - 4In order to fully equip the lab, the school orders 12 sets of beakers and 8 packs of test tubes.

a) the expression is 8t + 12bb)

The school office receives a bill for the supplies in the amount of $348.

The equation becomes8t + 12b = 348- - - - - - - - - -1

Substituting t = b - 4 into equation 1, it becomes

8(b - 4) + 12b = 348

8b - 32 + 12b = 348

8b + 12b = 34

8 + 3220b = 380b = 380/

20b = 19t =

b - 4 =

19 - 4

t = 15

Step-by-step explanation:

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step-by-step explanation: