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

Question

1559 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:

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

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

$r = 1.3$

How do you solve the equation 4.2r+7.14=12.64.2r+7.14=12.6?