Which equation represents a proportional relationship?
A) y=mx+b
B) Ax+By=C
C) y=mx
D) y=b
C
y=mx
Graph the equation
y=2x

Solve the system of equations.
y=x-3
y=-x+5
(4,1)
Mt. Laguna got 26 inches of snow overnight. Every hour, 1.5 inches of snow melts. How long will it take for the snow to melt to 14 inches?
8 hours
How many solutions does this system of equations have?

Infinite solution
Identify the slope and y-intercept of the equation
y=4x-7
Slope = 4
y-intercept = -7
Graph the equation
y=-1/3x+2

Solve the system of equations.
y=-2x+9
y=4x-3
(2,5)
Mary and Kevin are each saving money.
- Mary starts with $80 and saves $12 every week.
- Kevin starts with $120 and saves $5 every week.
After 5 weeks, who has more total money?
Kevin saved more.
Mary saved $140
Kevin saved $145
How many solutions does this system of equations have?

No solution
What is the slope of the line x=3 ?

No slope
Undefined
Write an equation for the graph

y=1/2x-1
Solve the system of equations.
y=1/2(8x-4)
y=3x+9
(11, 42)
Vicente and Dennis are each saving money.
- Vicente starts with $75 and saves $10 every week.
- Dennis starts with $90 and saves $5 every week.
When will they have the same total amount saved? How much money with they have?
They will both have $105 saved at week 3.
How many solutions does this system of equations have?
y=2x-8
y=2(x-4)
Infinite solutions
Identify the slope of the graph.

1/5
Write an equation for the graph

y=-3x+7
Solve the system of equations.
13x-5y=7
y=2x+1
(4,9)
A car is traveling 85 mph. A truck is 12 miles a head going 65 mph. How long will it take for the car to catch up to the truck?
0.6 hours or 36 minutes
How many solutions does this system of equations have?
y=1/3(9x+18)
y=3x-18
No solution
Identify the slope and y-intercept of the graph.

Slope = -1/3
y-intercept = 4
Solve by graphing the system of equation
y=1/2x+2
y=-1/4x+5

Solve the system of equations.
6x+2y=12
x-2y=-5
(1,3)
A piggy bank hold $4.50 worth of quarters and nickels. If there are 38 coins total, how many quarters and nickels are there?
13 quarters and 25 nickels
How many solutions does this system of equations have?
-9x+9y=4
y=-x+13
One solution