The x intersect is at 2,5 and the y intersect is at -1,5
2,5 + (-1,5) = 1
The answer should be the first option.
The first option says that the sum of x + y = more or the equal than 1.
Hope it helped!
Let
be the price of an adult ticket, and
the price of a child ticket.
The sentence "Three adults and four children must pay $122 for tickets" translates to 
The sentence "Two adults and three children must pay $87" translates to 
Which leads to the linear system

You can solve this system as you prefer, for example you can multiply the first equation by 2 and the second by 3 to get

Now subtract the first from the second:

Now plug this value for c in any of the equations, for example the first:

round both numbers up then multiply
43 * 14 = 602
20% percent decrease; 64-80= -16. -16÷80= -0.2×100 =20%