279,852 views
43 votes
43 votes
Find the value of 9u +4 given that 7u-4=3.

Simplify your answer as much as possible.
9u + 4 = 1
Х

User Carsten Gehling
by
2.9k points

2 Answers

10 votes
10 votes

Answer:


7u - 4 = 3 \\ 7u = 4 + 3 \\ 7u = 7 \\ u = (7)/(7) \\ \boxed{u = 1} \\\\f(u) = 9u + 4 \\ f(1) = 9(1) + 4 \\f(1) = 9 + 4 \\ \boxed{f(1) = 13 }

  • 13 is the right answer.
User CraigTeegarden
by
2.6k points
21 votes
21 votes

Answer:

• first get the value of u


7u - 4 = 3 \\ 7u = 3 + 4 \\ 7u = 7 \\{ \underline{ \: \: u = 1 \: \: }}

• find the value of 9u + 4:


9u + 4 = 9(1) + 4 \\ = 9 + 4 \\ { \underline{ \underline{ \: \: 13 \: \: }}}

User Thalatta
by
3.3k points
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