WU 11/11

Steffen graphed two lines in order to find the solution to a given system of equations.
What is the solution?

• (-3,-8)
• (-8,-3)
• (3,-8)
• (8,3)

Solve using elimination. 
 4x + 8y = 20
-4x + 2y = -30

• (-7,1)
• (2,-5)
• (-2,5)
• (7,-1)

Solve by elimination:
7x+y=-9

-3x-y=5

• No solution
• (1,8)
• (-2,-3)
• (-1,-2)

How would you graph y = ¹/₂ x + 2

• Allow your pencil to aimlessly drift across your paper until- Behold! A line is formed!

• Place a point at 0.5 on your y-axis. Then go up 2 and right 1 and place your second point. Draw your line.

• Start at the origin and go down 1 and over 2 again and again until you see your line.

• Place a point at 2 on the y-axis. Then from that point go up 1 and right 2 and place your second point. Draw your line. (Or make a t-chart)

If you where to graph the equation y = 2x - 3, how would you begin?

• By going up 2 and over 1

• By placing a point at -3 on the y-axis

• By going down 2 and over 3

• By going up 2 and over 3

What is the solution?

• (1, -1)
• (-1, 1)
• (0, -2)
• (2, 0)

1)  -4x-2y=-12
      4x+8y=-24

• (6,-6)
• (-6,6)
• (6,6)
• (-6,-6)

Solve the system of equations.
x + 2y = -3
x - y = -12

• (-9, 3)
• (-7 ,5)
• (3, 15)
• (9, 6)

 $3x-2y=12$  

 $2x+2y=-2$  

What variable will eliminate in the system? 

• x

• y

• both

• neither

     $7x+5y=-12$  
 $10x+5y=5$  
What does the second equation need to be multiplied by to get the y's to eliminate?

• 5

• 0

• -1

• 2