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4 years ago

Solving linear equation 7-x=19

Mathematics

2 answers:

earnstyle [38]4 years ago

8 0

Answer:

x = -12

Step-by-step explanation:

To solve an equation, you want to "undo" what has been done to the variable. Here, it has been multiplied by -1 and that result added to 7. In general, you want to "undo" these operations in reverse order.

First, you need to subtract 7 to undo the addition of 7. Of course, anything you do to one side of the equation is also done to the other side:

7 -x -7 = 19 -7

-x = 12 . . . . . . . . simplify

Now, you want to undo the multiplication by -1. Multiplication (or division) by -1 will take care of that:

(-1)(-x) = (-1)(12)

x = -12 . . . . . . . . simplify

The solution is x = -12.

alex41 [277]4 years ago

5 0

X is equal to -12
7-(-12)=19

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