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Naya [18.7K]
3 years ago
12

Tickets to the museum cost $18 for adults and $12 for children. A group of 20 people went to the museum, and the tickets cost $3

24. The system of equations models this situation, where x is the number of adults and y is the number of children.
x+y=20
18x+12y=324
How many adults and how many children were in the group?
A.
8 adults and 12 children

B.
10 adults and 10 children

C.
12 adults and 8 children

D.
14 adults and 6 children
Mathematics
1 answer:
poizon [28]3 years ago
8 0
X= adults
y=children



x+y=20
x=20-y


18x+12y=324
18(20-y)+12y=324
360-18y+12y=324
-6y=324-360
-6y=-36
y=-36/-6
y=6

x=20-y
x=20-6
x=14




14 adults and 6 children
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The slopes are the same for both equations, so the lines are parallel. With no intersection, there is no solution.

It may be easier to graph the system if you change the equations to slope intercept form  y = mx + b

That locates the y-intercept, <em><u>b</u></em> and you can use the slope, <em><u>m</u></em> to plot additional points to draw the lines.

The attachment shows the graph of this system of equations.

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<u>First equation:</u>

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3y = –2x + 6 . Divide both sides by 3

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At this point we see that the slopes are the same, so the lines are parallel.

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