"Rita's father is seven times as old as Rita is. One year ago, he was nine times as old as Rita was. Find Rita's present age." Anyone know how?
Stacey Warren - Expert brainly.com
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maybe; if im quick i can get it done b4 library closes :)
f = 7r
f-1 = 9r
7r -1 = 9r
-1 = 2r
r = -1/2....doesnt seem right lol
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7r -1 = 9r -9
8 = 2r
r = 4
f = 28 ; r = 4
Rita's father: x
i) 7y = x
ii) 9*(y-1) = (x-1)
i) 7y = x
ii) 9y - x - 8 = 0
i -> ii) 9y - 7y - 8 = 0
y = 4
i) x = 7y
x = 28
why add confusion by naming variables that have no relation to the elements that you are examining? never made sense to me...
Rita = r ; Rita father = f gives you a visual on what you are equating....
That said; that variables dont care what they are called :) so x and y is just as valid....