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denis-greek [22]
3 years ago
15

Simplify and solve this equation: 4m+9+5m-12=42

Mathematics
2 answers:
s2008m [1.1K]3 years ago
5 0
You first must add together the same values
So
4m+5m=9m
+9+-12 =-3
So you have
9m-3=42
Then you put the -3 on the other side you you add 3 in to both sides so now you have
9m =45
And then divide 45 divided by 9 = 5
So the answer is m=5
zimovet [89]3 years ago
4 0
First you combine like variables
9m - 3 = 42
then add both sides
9m = 45
then divide whats left
m = 5 
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Answer:

The given equation is NOT justified.

Step-by-step explanation:

Here, the given equation is (\frac{-1}{2}x + \frac{6}{7} )  -  (\frac{7}{2}x - \frac{4}{7} )   = -4x + \frac{2}{7}

Now, here Consider the left hand side and simplifying the left side by operating on the like terms,

⇒(\frac{-1}{2}x + \frac{6}{7} )  -  (\frac{7}{2}x - \frac{4}{7} )   = \frac{-1}{2}x + \frac{6}{7}   -  \frac{7}{2}x + \frac{4}{7}  =  (\frac{-1}{2}x -\frac{7}{2}x) + (\frac{6}{7}   + \frac{4}{7})

=(\frac{-1 - 7}{2}x ) + (\frac{6 + 4}{7} ) = \frac{-8x}{2} + \frac{10}{7}   \neq -4x + \frac{2}{7}

Here, Left side of equation  ≠ Right side of the equation

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