SOLUTION: given:4-7x=25 prove:x=-3 (note: that's all I have figured out so far) statement reason a.4-7x=25 a.given b.-4+4-7x=-4+25 b.sub. prop. of = c.0-7x

Algebra ->  Geometry-proofs -> SOLUTION: given:4-7x=25 prove:x=-3 (note: that's all I have figured out so far) statement reason a.4-7x=25 a.given b.-4+4-7x=-4+25 b.sub. prop. of = c.0-7x      Log On


   

Question 1106460: given:4-7x=25
prove:x=-3
(note: that's all I have figured out so far)
statement reason
a.4-7x=25 a.given
b.-4+4-7x=-4+25 b.sub. prop. of =
c.0-7x=21 c.
d.-7x/-7=21/-7 d. division property of equality
e.1x=21/-7 e.
f.x=-3 f.substitution
Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!

I've actually never seen an algebraic expression worked out like a Geometric 'proof' before. Here's how I'd do it:
given: 4-7x = 25
If we solve this for x that "proves" the value, no?
—
4-7x -4 = 25 - 4 ( equal quantities minus 4 are still equal quantities )
-7x = 21 ( simplified, both sides )
-7x/-7 = 21/-7 ( equal quantities divided by -7 are still equal quantities )
x = -3 ( simplified, both sides )
Done.