3 years ago

Find the value of 3u-8 given that -7u + 9=2

Mathematics

2 answers:

bulgar [2K]3 years ago

8 0

Answer:

-5

Step-by-step explanation:

-7u+9=2

-7u=2-9

-7u=-7

7u=7

u=7/7

u=1

3(1)-8=3-8=-5

eduard3 years ago

8 0

Step 1: Solve for u using the equation -7u+9=2

-7u+9=2
-9 -9
_________
-7u=-7
__ __
-7 -7
_________
U=-1

Step 2: Substitute u into 3u-8

3u-8
3(-1) -8
-3 -8
-11

The value of 3u-8 is -11

Hope this helps comment below for more questions :)

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Mice21 [21]

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3 years ago

If a is a positive integer and b is a negative integer, which expression must be positive?

nydimaria [60]

So, let's solve all of them and see:

a - (-b) = a + b ⇒ can be either positive or negative, depending on the numbers

a + (-b) = a - b ⇒ can either be positive or negative, depending on the numbers

a * (-b) = a * (-b) ⇒ negative answer no matter what

a / (-b) = a / (-b) ⇒ negative answer no matter what

So the answer is:

<em>"None of the above"</em>.

Hope it helped,