Either move the negative over to the other side to become positive, or divide the entire equation by -1 to get it to a positive.
Example:
-3x + 12 = 30
Move the -3x over to get
12 = 30 + 3x
12 - 30 = 3x
- 18 = 3x
- 6 = x
OR
Divide by -1 to get
3x - 12 = - 30
3x = - 30 + 12
3x = -18
x = -6
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Yes, and it would be a negative slope.
Equations are not linear when they are quadratic equations which are graphed in the form of a parabola
They are not. A vertical line is not a function so all linear equations are not functions. And all functions are not linear equations.
Linear equations are a small minority of functions.
Most functions are not like linear equations.