Question

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

Answer 1

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


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Answer 2

-5

Explanation:

-7u+9=2

-7u=2-9

-7u=-7

7u=7

u=7/7

u=1

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