Question 829006: Eileen is 21 years old, which is 6 less than 3 times Minnie’s age in years. Write an equation to find Minnie’s age. How old is Minnie?
You can put this solution on YOUR website! ---
x = eileen
y = minnie
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x = 21
x = 3y - 6
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put the system of linear equations into standard form:
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x = 21
x - 3y = -6
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solution by matrix method:
x = eileen = 21
y = minnie = 9
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now by substitution:
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x = 21
x = 3y - 6
21 = 3y - 6
3y = 27
y = 9
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solution by substitution method:
x = eileen = 21
y = minnie = 9
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both method agree !
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