Homework Help: algebra

Posted by Libby on Tuesday, June 21, 2011 at 1:23pm.

As you are leaving the community, you notice another new community just down the street. Because you are in the area, you decide to inquire about it.

a. The sales representative here tells you they also have two floor plans available, but they only have 38 homes still for sale. Write an equation that illustrates the situation. Use x and y to denote floor plan one and floor plan two respectively.

b. The representative tells you that floor plan one sells for $175,000 and floor plan two sells for $200,000. She also mentions that all the available houses combined are worth $7,200,000. Write an equation that illustrates this situation. Use the same variables you used in Part a.

c. Use elimination to determine how many houses are available in each floor plan. Explain how you arrived at your answer.

algebra - PsyDAG, Wednesday, June 22, 2011 at 12:51pm
a. x + y = 38 therefore

x = 38-y

b. 175X + 200y = 7200 (expressed in thousands)

Substitute 38-y for x in last equation and solve for y. Insert that value into the first equation and solve for x. Check by inserting both values into the last equation.

I used substitution rather than elimination.

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