Miguel, this is the solution:
We have the equation:
x + 2y = 4
Let's write it in the form:
y = mx + b, where m is the slope of the line.
2y = -x + 4
Dividing by 2 at both sides:
2y/2 = -x/2 + 4/2
y = -x/2 + 2
The slope of the line is -1/2
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