The oil a lamp burns at a linear rate. the lamp contained 13 ounces of oil ten mins adter it was lit . it contained seven ounces of oil 38 minutes adter it was lit .how many ounces dose it burn per min

Explanation:

That the oil of a lamp burns at a linear rate means that the rate of burn is constant.

Hence, you can calcualte the rate with which the lamp burns the oil using any two ordered pairs.

Your two ordered pairs are (13 ounces, 10 min) and (7 ounces, 38 min).

Substituting those pairs in the equation for the rate, you get:

The negative sign just shows that the amount of oil is decreasing (the oil is being burned).

Hence, the lamp burns 6 ounces of oil per min.

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