Evaluate 3x + 8y if x = 2/3 and y = -1.

x = 2/3 y = - 1

3x + 8y

Now put the values of x and y in the relation, we get

= 3(2/3) + 8(- 1)

= 3*2/3 - 8

= 6/3 - 8

= 2 - 8

= - 6

Hence

3x + 8y = - 6 if x = 2/3 and y = - 1

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