Lesson: Solving Proportions
 A proportion is two fractions A proportion is two fractions2x105 A proportion is two fractionstwo fractions2x105 A proportion is two fractionsseparated by an equal sign2x105 A proportion is two fractionsseparated by an equal sign2x=105 A proportion is two fractionsseparated by an equal sign2x=equal sign105 To solve a proportion To solve a proportion2x=105 To solve a proportionwe use cross multiplication2x=105 To solve a proportionFirst multiply one diagonalwe use cross multiplication2x=105 To solve a proportionFirst multiply one diagonalwe use cross multiplication2x=105 To solve a proportionFirst multiply one diagonalwe use cross multiplication2x10x=105 To solve a proportionFirst multiply one diagonalwe use cross multiplicationthen multiply the second diagonal2x10x=105 To solve a proportionFirst multiply one diagonalwe use cross multiplicationthen multiply the second diagonal2x10x=105 To solve a proportionFirst multiply one diagonalwe use cross multiplicationthen multiply the second diagonalfinally put an equal sign in between them2x10x=10105 To solve a proportionFirst multiply one diagonalwe use cross multiplicationthen multiply the second diagonalfinally put an equal sign in between them2x10x==10105 To solve a proportionFirst multiply one diagonalwe use cross multiplicationthen multiply the second diagonalfinally put an equal sign in between them2x10x==10105then solve the equation To solve a proportionFirst multiply one diagonalwe use cross multiplicationthen multiply the second diagonalfinally put an equal sign in between them2x10x==10105then solve the equationx = 1 Which equation is the result of cross multiplication5x5x = 24020x = 6012x = 100=2012 5xx = =2012 If the proportion contains a binomial If the proportion contains a binomialx - 34=32 If the proportion contains a binomialx - 34=proportion32 If the proportion contains a binomialx - 34=binomial32 If the proportion contains a binomialcross multiplication will involve parenthesisx - 34=32 If the proportion contains a binomialcross multiplication will involve parenthesisx - 34=32 If the proportion contains a binomialcross multiplication will involve parenthesis2(x - 3)x - 34=32 If the proportion contains a binomialcross multiplication will involve parenthesis2(x - 3)x - 34=32 If the proportion contains a binomialcross multiplication will involve parenthesis2(x - 3)x - 3412=32 If the proportion contains a binomialcross multiplication will involve parenthesis2(x - 3)x - 34=12=32 If the proportion contains a binomialcross multiplication will involve parenthesis2x - 6 = 122(x - 3)x - 34=12=32 If the proportion contains a binomialcross multiplication will involve parenthesis2x - 6 = 122(x - 3)2x = 18x - 34=12=32 If the proportion contains a binomialcross multiplication will involve parenthesis2x - 6 = 122(x - 3)2x = 18x = 9x - 34=12=32 Which equation come from cross multiplication?x + 533(x + 5) = 847(x + 5) = 3612(x + 5) = 21=127
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