You can put this solution on YOUR website! ---
h(x) = 23
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is indeed a linear function:
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namely, it's a horizontal line (slope=0), at y = 23
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in the general sense, it's a linear equation of the form:
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y(x) = mx + b
m = 0
b = 23
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hence:
y(x) = 0x + 23
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