How do you solve #4x - 9=51#?

Question

2472 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-03-19T21:58:41

x=15

Isolate the variable, then get rid of any coefficients

#4x-9=51#

#4x=60#

#x=15#

Answer 2 · 2018-03-19T21:59:08

The answer is 15

You do the inverse operation of the 9 and add it to the 51 giving you 60 then just divide and you get your answer 15

Answer 3 · 2018-03-19T21:59:23

#x=15#

#4x-9=51#

Add #9# to each side to get the #4x# by itself.

#4x -9 +9 = 51 +9#

#4x=60#

Then divide by #4# on each side

#(4x)/4=60/4#

#x=15#

Answer 4 · 2018-03-19T22:00:03

See a solution process below:

First, add #color(red)(9)# to each side of the equation to isolate the #x# term while keeping the equation balanced:

#4x - 9 + color(red)(9) = 51 + color(red)(9)#

#4x - 0 = 60#

#4x = 60#

Now, divide each side of the equation by #color(red)(4)# to solve for #x# while keeping the equation balanced:

#(4x)/color(red)(4) = 60/color(red)(4)#

#(color(red)(cancel(color(black)(4)))x)/cancel(color(red)(4)) = 15#

#x = 15#