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How do you evaluate the expression #3x+2y+4+9y# if #x=8#, #y=4#?

Answer 1

Gianna Caruso

#72#

Plug in #8# for #x# and #4# for #y#:

#3(8)+2(4)+4+9(4)#

#24+8+4+36#

#36+36#

#72#

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Answer 2

Aurora Arias

To evaluate the expression (3x + 2y + 4 + 9y) when (x = 8) and (y = 4), substitute the values of (x) and (y) into the expression:

[3(8) + 2(4) + 4 + 9(4)]

Simplify each term:

[3 \times 8 = 24] [2 \times 4 = 8] [4] [9 \times 4 = 36]

Now, add all the terms together:

[24 + 8 + 4 + 36]

[= 72]

So, the value of the expression (3x + 2y + 4 + 9y) when (x = 8) and (y = 4) is (72).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.