Answer:
x: (1,0)
y: (0,-2)
Step-by-step explanation:
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The height of the envelope is 10. This is because you divide the area by 3. So, the missing side is 10 inches.
Let a and c represent, respectively, the price of an adult and a child ticket. We know that

Multiply the first equation by 3 and the second equation by 2 to get

Subtract the two equations to have

Plug this value in the first equation to get

101/400 or .3025 is your answer