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How are the graphs of y = -3x and y = 3x related?

User SABANTO
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the slope of y = 3x is 3, and the slope of y = -3x is well, yes, you guessed it, is -3, same value, just different sign, and when that happens the slopes are just mirroring each other, in this case, the mirror line, line of symmetry, is the y-axis, notice in the picture below.
How are the graphs of y = -3x and y = 3x related?-example-1
User Englealuze
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