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DO NOW
In this proportion, what value of x would make it true?
LEARNING TARGET
LEARNING TARGET
I can solve for a missing part of a proportion using cross-multiplication.
I can solve for a missing part of a proportion using cross-multiplication.
I DO
I DO
Let's review cross-multiplication:
Let's review cross-multiplication:
Multiply one part of the cross, write an equal sign, multiply the other part of the cross.
So, what do you do if there is a variable in the proportion? You still do cross-multiplication, then you SOLVE THE EQUATION like an Algebra Wizard!
Let's do some examples:
WE DO
WE DO
Let's get telepathic!
YOU DO
YOU DO
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Exit ticket
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