Friday, February 13, 2009

7-4 Enrichment

Inventors? Who are they?

2 comments:

Anonymous said...

Emily Christy

Problem 1


x+y=2
x-y=10

x=(2-y)

(2-y)-y=10
2-y-y=10
2-2y=10
-2y=8
y=-4

plug that in for y in either equation.

x+y=2
x+(-4)=2
x-4=2
x=6

Sara Boone inventd the ironing board. Which is letter "E" (6,-4)

Brianna said...

Brianna Barrows

Problem 2



x=2-y
2y+x=9
x=(2-y)

2y+(2-y)=9
2y+2-y=9
y+2=9
y=7

plug y in for the first equation(x=2-y)

x=2-7
x=-5

Sarah Goode invented the folding cabinent bed. Which is letter "D" (-5,7)