Writing Your Own Formulas Ed

Writing Your Own Formulas

• So far we’ve been learning how to solve equations and a whole bunch other stuff. 6-x(y-3)

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BUT, what good is Math without talking about our beautiful world??

In a problem, you are usually asked to find an unknown.

When writing the formula, we represent this unknown with a lower-case letter.

When solving a problem, write out what info is given, other information that is important, and what you don’t know. EXAMPLE: Joe Schmo spends $10 each month on soda. How much does Joe Schmo spend in one year?

EXAMPLE: Joe Schmo spends $10 each month on soda. How much does Joe Schmo spend in one year? GIVEN: WRITE WHAT $10 a month INFO IS GIVEN IS IMPORTANT 12 months in a year DON’T KNOW YET Spend in a year (s) EQUATION $10 (12) = s

WRITE WHAT YOU DON’T, (And pick a variable) WRITE THE EQUATION

200 cars are built each day. How many days will it take to build 5000 cars? WRITE WHAT KNOW:  200 cars per INFO IS GIVEN day TO YOU  Need to build 5000

DON’T KNOW How many days (d) Formula:

WRITE WHAT YOU DON’T KNOW, (And pick a variable) WRITE THE EQUATION

Translation: English to Math “is the same” “is identical to” “is equal to” “equals” “is”

=

-

Translation: English to Math

“LESS”

“MINUS”

Translation: English to Math

“PLUS”

+

Translation: English to Math

“The Sum Of…”

(Two numbers Grouped and added…)

( ? +? )

Translation: English to Math

“ A Number” (a number we don’t Know yet…)

(…so pick any letter!)

X

Translation: English to Math

“TWICE”

2•

Translation: English to Math

“Half…”

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PRACTICE Twice the sum of a number and 15 minus 32 is 235. Write out the formula.

2•(x + 15)- 32= 235 Let’s Solve it!! Yay !!

Write this formula in words: If x = distance, y = time and v = velocity, write the following formula in words:

5(x + y) = v - 45 Five times the sum of distance and time equals 45 less than velocity is equal to velocity minus 45 is