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I need help with #29 I really don't understand it (picture included)

I need help with #29 I really don't understand it (picture included)-example-1

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4x+4(3)+4(2)=y
4x+20=y
X equals the amount it cost for each ticket which is unknown. Y equals the total cost. Because the amount of the food is provided, it can be calculated unlike the tickets which is just left at 4x. The work for the snacks are upwards. Its mostly substitution.
User Micah R Ledbetter
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