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The direction of variation of reference functions

What is the direction of the graph of  f(x)=x3f(x)=x-3 ?

What is the direction of the graph of f(x)=x+7f(x)=-x+7 ?

What is the direction of the graph of f(x)=xf(x)=-x ?

What is the direction of the graph of f(x)=10xf(x)=10-x ?

What is the direction of the graph of  f(x)=9+xf(x)=-9+x ?

What is the direction of the graph of f(x)=3x+9f(x)=3x+9 ?

What is the direction of the graph of f(x)=5+2xf(x)=-5+2x ?

What is the direction of the graph of f(x)=4xf(x)=4x ?

What is the direction of the graph of  f(x)=3x+9f(x)=-3x+9 ?

What is the direction of the graph of f(x)=52xf(x)=5-2x ?