Hi there!
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I believe your answer is:
m = 1
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Here’s why:
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[tex]\boxed{\text{General Slope-Intercept Form:}}\\\\y = mx + b\\\rule{150}{0.5}\\\text{m - slope}\\\text{b - Y-intercept}[/tex]
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The slope is '1'. Unusually, the 1 is not written in equations. Since '1' would take m's place, the slope of the given equation is 1.
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Hope this helps you. I apologize if it’s incorrect.