Find the value of the expression 6x + 3xy, when x = 2 and y = 4.

➷ Substitute in the values:

6(2) + 3(2)(4)

Now just solve:

12 + 24 = 36

The answer is 36

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5x = -15

5 represents time in weeks

x represents the quantity I am trying to find

-15 is my result after a 5 week period of temperature decline at a rate of x.

Now when we solve for x, we get x = -3.

Therefore the rate of which the temperature has dropped has been identified at -3 degrees per week of temperature decline.

Can you let me know if this helps, thx