197k views
1 vote
Find the value of 3u-8 given that -7u + 9=2

User ManueGE
by
8.2k points

2 Answers

2 votes
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 :)
User Ifesinachi Bryan
by
8.7k points
1 vote

Answer:

-5

Explanation:

-7u+9=2

-7u=2-9

-7u=-7

7u=7

u=7/7

u=1

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

User Kavadias
by
8.2k points

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