How do you solve the equation #4.2r+7.14=12.6#?

Question

1046 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-02-20T18:00:14

See the entire solution process below:

Step 1) Subtract #color(red)(7.14)# from each side of the equation to isolate the #r# term while keeping the equation balanced:

#4.2r + 7.14 - color(red)(7.14) = 12.6 - color(red)(7.14)#

#4.2r + 0 = 5.46#

#4.2r = 5.46#

Step 2) Divide each side of the equation by #color(red)(4.2)# to solve for #r# while keeping the equation balanced:

#(4.2r)/color(red)(4.2) = 5.46/color(red)(4.2)#

#(color(red)(cancel(color(black)(4.2)))r)/cancel(color(red)(4.2)) = 1.3#

#r = 1.3#