Transcript Step 1

Solve:
Y + 12 = 312
Y = 300
Solve
3z = 612
Z = 206
Try this one!
5w – 13 = 263
W = 50
Solving two-step equations
 Step 1: draw in your balance line.
 Step 2: use the addition or subtraction property of equality to get
the term with a variable alone on one side of the equation.
 In other words, do the opposite of what your original equation has. For example,
if the equation is 2x +2 = 10, you want to subtract 2 first FROM BOTH SIDES.
 Step 3: use the multiplication or division property of equality to write an
equivalent in which the variable has a coefficient of 1.
 If we are still using our above equation (2x + 2 =10) and we have already
subtract 2 from both sides, giving us 2x = 8, we can now do the opposite of what
our equation asks. We will divide two from both sides and get the answer x = 4
Practice!
Solve the following:
3x – 30 = 660
w + 15 = 30
5
Let’s work the other way…
 Write a variable equation for the following word problem and solve:
You are ordering tulip bulbs from a flower
catalog. You have $14 to spend. 1 tulip bulb
cost .75 cents and $3 shipping cost is added
to your entire purchase. How many tulip bulbs
can you buy?
.75x + 3 = 14
X = 14.6
 Write a variable equation for the following word problem and solve:
Suppose you are helping to prepare a large meal.
You can peel 2 carrots per minute. You need 60
peeled carrots. How long will it take you to finish if you
have already peeled 18 carrots?
2t + 18 = 60
T = 21 minutes
Homework!
 Pages 84-85 #’s 1-35Odd, 59-72all