Writing Equations
Twenty minus the quotient of 7 and x is the same as twice x
20 - 7/x = 2x
Example 1
On Page 66 - Do Example 2
all 3 steps
Step 2 - 799, 430, 193
Step 3 - (430 + 193) + n = 799
Fill in the blanks on Example 3, page 67
all 4 steps
step 1 - perimeter, the length, and the width
step 2 - l=length w= width
step 3 - two times
step 4 - P = 2(l + w)
Write a sentence for the equation
2z-1 = 5
two times z minus 1 equals 5
Example 4
Complete Example 5 on page 68
Three times the quantity y plus one equals twelve
In the surface area formula S = 2LW + 2LH + 2WH what does 2LW+ mean? and what does 2WH mean?
two times length times width plus
two times width times height
Example 6 first 2 boxes
Four times a number less 10 is equal to 16
4x-10=16
Check Example 1
Etu has read 12 of the 32 chapters in his assigned book. He plans to finish the book by reading c chapters each day for 8 days until the book is due. Look at the check on page 66 and pick the best answer.
Translate into a formula: The horsepower of a motor is the product of the motor speed and the torque divided by 5252. Look at the check on page 67 and pick the best answer.
B) H = MT / 5252
Write a sentence for the equation
6z-15=45
A) Six times a number z minus fifteen equals forty-five
Check a on page 68
Look at the check on page 69, pick the correct answers
A, C, E
finish the blanks for example 6 on page 69
rectangle, LW, back, left, sum of the areas of the faces
What distinguishes an expression from an equation?
An equation contains an equal sign an expression does not
Think about it page 65
Question 6
24 + 9h = 42
Question 10
(p + t)-7 = 6
Write a sentence for the equation
(y+3)2=25
C) The quantity y plus 3 squared is 25
check b on page 68
Question 24
one third minus four fifths of z is four thirds of y cubed
Do the check on page 70
Part A) A
Part B) A, B, E
Question 1
3m + 2 = 18
Question 8
3t + 39,000 = 216,000
Question 12
4 (f + g) = 6g
Question 20
four times m is equal to fifty two
Question 26
2 times the quantity t plus 4 times q is 2 times q plus 4 times t
Question 32
the volume equals pi times the radius squared times the height. the base is a circle so the expression represents the area of the base
Question 4
85-9y=7(4 + y)
no,
Question 18
SA = 2 ( WH + LW + LH)
Question 22
Fifteen less than the square of r equals the sum of t and nineteen
Question 30
k squared minus n squared is twice b
question 36
distance equals rate times time. The expression rt represents the distance traveled by moving at a rate r for a time t