You can put this solution on YOUR website! how would you solve this problem? f(0)=-1;f(x) decreases by 3 when x increases by 1.
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f(0)=-1 tells you the y-intercept is -1
f(x) decreases by 3 when x increases by 1 telly you the slope is -3
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The equation that relates x to f(x) is f(x)= -3x-1
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Cheers,
Stan H.