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Q: If x equals 10 and y equals 8 then 7x plus 8y equals?

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If x equals 10 and y equals 10, then 9x plus 8y equals 170.

36..thats very simple..lol

8y-7x

7x + 8y

it would simply still be 7x+8y You must have "like terms" to add variables meaning they both must be x or y . so your answer would still be 7x+8y

4x + y = 9 so that y = 9 - 4x 7x - 8y = 6 7x - 8*(9-4x) = 6 7x - 72 + 32x = 6 39x = 78 x = 2 Then y = 9 - 4x = 9-4*2 = 9-8 = 1

56xy + 2y + 3x

2x = -7 - 8y

That would depend on the plus or minus values of 7x and 10y of which none have been given.

10*6+8*7 = 116

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