Posted by Devin on Wednesday, March 31, 2010 at 12:43am.
1. Imagine you are in the market for a new home and are interested in a new housing community under construction in a different city.
a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the situation.
x+y=56 ?
b. The sales representative later indicates that there are three times as many homes available with the second floor plan than the first. Write an equation that illustrates this situation. Use the same variables you used in Part a.
3x=y ?
c. Use the equations from Parts a. and b. of this exercise as a system of equations. Use substitution to determine how many of each type of floor plan is available. Describe the steps you used to solve the problem.
d. What are the intercepts of the equation from Part a. of this problem? What are the intercepts from Part b. of this problem? Where would the lines intersect if you solved the system by graphing?
need help with C and d

algebra  PsyDAG, Wednesday, March 31, 2010 at 1:15pm
c. Substitute 3x for y in the first equation to solve for x. Use that value in the second equation to find y. Check by putting both values in the first equation.
d. I cannot help you with the intercepts. 
algebra  Shauna, Thursday, October 14, 2010 at 11:44pm
Floor plan one = x = 14 available
Floor plan two = y = 42 available
I substituted y = 3x into the equation x + y = 56 for x. Therefore I had (3x + x = 56) and I solved for x which gave me x = 14. To find y, I plugged x into the equation in (a) which gave me 14 + y = 56 and solved for y which gave me y = 42.