As you are leaving the area, you notice another new community just down the street. Because you are in the area, you decide to inquire about it. The sales representative informs you that there are 45 houses for sale in this community with two floor plans still available. The variable x represents floor plan one and y represents floor plan two. The equation that illustrates the situation is x + y = 45.
The sales representative later indicates that there are two times as many homes available with the second floor plan than the first. The equation that illustrates this situation is y = 2x.
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I don't see a question but intuit that the question is the find the number of houses on each floor plan. I will work the problem accordingly.
x = number of houses on Plan I
y = number of houses on Plan II
x + y = 45
2x = y
In x + y = 45 , substitute (2x) for y
x + 2x = 45
3x = 45
x = 15 --> houses on plan I
2(15) = 30 ---> houses on plan II