Mayuran K. answered • 11/24/15

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Let the cost of an adult ticket be x and y be the cost of a child's ticket now using this I'm going to form two equations

5x + y = 31.30

2x + 3y = 19.80

Multiply the top equation by -3

-15x - 3y = -93.90

Now add this to equation 2

-13 x = -74.10

x = 5.7

So the cost of an adult ticket is $5.70

Substitute this value for x in the first equation

(5.70)5 + y = 31.30

Y = 31.30 - 28.50

y = 2.80

The cost of a child ticket is $2.80

There you go