On the first day of a music concert, the price of 12 adult tickets and 4 child tickets is 84$. The second day the concert made 78$ by selling 6 adult tickets and 14 child tickets. Find the price of an adult ticket and the price of an child ticket.

12x + 4y = 84

6x + 14y = 78

12x + 4y = 84

-12x - 28y = -156

-24y = -72

y = $3 child ticket

12x + 12 = 84

12x = 72

x = $6 adult ticket

Step-by-step explanation:

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation:

answer: median

step-by-step explanation:

the median is the middle value when a data set is ordered from least to greatest