1 Step Equations
3x + 3 = 15
x=4
With division.
Julia's sunflower plant grew 9 inches over the summer. Her plant is now 23 inches tall. How tall was it at the beginning of the summer?
Let s = height of sunflower plant in inches
s + 9 = 21
(-9) (-9)
s = 14 inches tall
9x = 81
What is 9.
How do you undo addition?
With subtraction.
Logan bought three packs of gum for $4.95. What did Logan pay for one pack of gum?
Let g = cost of gum
Set up an equation and solve.
3g = 4.95
g= $1.65 for one pack of gum
r/5 + 7 = 4
r = -15
Another word for the "opposite" operation.
Inverse.
Leia already has $62. She begins to save more money at a rate of $5 per week. Let the variable w be the number of weeks Leia has been saving.
Determine how many weeks it will take her to save $127.
5w + 62 = 127
w = 13 weeks
4(x+3) = -8
x = -5
Your answer to an equation, you are looking for the VALUE of what?
The Variable.
On Monday, 475 students went to the amusement park. There were 10 buses, and 5 students rode in cars. How many students did each bus hold? Choose the correct equation and solve.
A) 10s + 5 = 475
B) 5s - 10 = 475
What is A.
s = 47 students per bus
h/-21=-4
What is 84.
x - 10 / 5 = 7
x = 45
Put these phrases in the order in which you would solve a 2-step equation.
(a) Undo addition/subtraction.
(b) Locate/circle the variable.
(c) Undo multiplication/division.
(b) Locate/circle the variable
(a) Undo addition/subtraction.
(c) Undo multiplication/division.
Anthony bought a soft drink for $3. He then bought 5 candy bars. He spent a total of $28. How much did each candy bar cost? Choose the correct equation and solve.
A) 3c - 5 = 28
B) 5c + 3 = 28
What is B.
c = $5 per candy bar.