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How do you solve 6x-4y equals 54 -9x plus 2y equals -69 using substitution?

Anonymous

∙ 13y ago

Updated: 12/24/2022

-9x + 2y = -69

So 2y = 9x - 69

The other equation can be written as

6x - 4y = 54 or 6x - 2*2y = 54

Substituting for 2y gives

6x - 2*(9x - 69) = 54

6x - 18x + 138 = 54

12x = 84

x = 7

and then 2y = 9x - 69 = 9*7 - 69 = 63-69 = -6

so that y = -3

Wiki User

∙ 13y ago

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