y - x = 3
y = _____
y = x + 3
-or-
y = 3 + x
x + y = -3
y = x + 3
POI (_ , _)
Graph &
POI (-3,0)
y = x
y = 2x - 4
POI (_ , _)
POI (4, 4)
You're going to a special farmers market. It is $10 for a basket and $5 per pound for anything that goes into that basket.
How would you describe the cost of buying things at this market as a rule?
y = 10 + 5x
-or-
y = 5x + 10
What is the average annual rainfall measured at SFO?
Closest without going over gets the points!
8.91 inches of rain per year
2y = 4x + 12
y = _____
y = 2x + 6
y = 2x
y = x + 1
POI (_ , _)
Graph &
POI (1, 2)
y = x + 3
y = -2x - 3
POI (_ , _)
POI (-2, 1)
Draw a smiley face.
The first two teams to raise their board get points.
What is the population of Mill Valley?
Answers within 1,000 above and below get points.
14, 185
(13,185 through 15,185 get points)
3y + x = 7x + 9
y = _____
y = 2x + 3
First two students to (silently) stand up earn points for their team!
Don't forget, other classes are in session... please keep the noise down!
y - 4x = 8
y = 2(2x + 4)
POI (_ , _)
INFINITE SOLUTIONS!
The lines are "colinear"
(fancy math way of saying the same)
A bunny weighs 5 pounds and gains 3 pounds per year.
A cat weighs 19 pounds and gains 1 pound per year.
Write rules for the bunny and the cat.
Bunny = 5 + 3x
Cat = 19 + x
Is there rain predicted for this weekend?
NO!
Get out there and enjoy the weekend!
3x + 7 = x - 2y -1
y = _____
y = -x -4
y = -2x
x = 0
POI (_ , _)
Graph &
POI (0, 0)
3(y - x) -2 = 4 + 6x
y = x - 3
POI (_ , _)
POI (-5/2 , -11/2)
-or-
POI (-2 1/2 , -5 1/2)
There were 18 students in math class at the beginning of the year, and 1 student was added each month.
There were 30 students in history class at the beginning of the year, and 2 students left each month.
Which do you like better, history or math?
Math? History? POINTS??
FYI - they both have 22 students after 4 months & it pays off to read the full directions before starting a problem!
What is the oldest trail race in America?
The Dipsea Trail Race was started in 1905
Write down all team members favorite colors
Which color is the most popular?
y = 1/4 x
x + 4y = 8
POI (_ , _)
Graph &
POI (4, 1)
y = 1/4x
4y - x = 8
POI (_ , _)
NO SOLUTION
They are parallel lines.
The population of Wheresville is 2,500 and shrinking by 50 each year.The population of Whatsburg is 1,250 and growing by 75 each year.
Write rules for each population. When do they have the same population?
Wheresville = 2500 - 50x
Whatsburg = 1250 + 75x
Same population (2000) in 10 years
Whoever picked this tile has to come up front for a round of pictionary!
12 seconds to draw, each team gets ONE guess on their board. All right answers get points.