Question 195941
1)


only solution: 7 ---> x=7 occurs twice



x=7 or x=7


x-7=0 or x-7=0



(x-7)(x-7)=0


x^2-14x+49=0


Ans: equation is y = x^2-14x+49



2)


Jim's rate: 1/7 lawn/hour

Sue's rate: 1/4 lawn/hour



Add rates and multiply by "t". Set equal to 1:



t(1/7+1/4)=1



t(11/28)=1



t=28/11


t=2.5455


Ans: takes about 2.5455 hours working together



3)


y=kx


6=k(3)


6/3=k


k=2


Equation: y=2x



4)



Somebody Already answered ---> http://www.algebra.com/algebra/homework/Graphs/Graphs.faq.question.195950.html