Practice problem
Select the linear functions.
f(x)=3f(x)=3f(x)=3
f(x)=3×xf(x)=3\times xf(x)=3×x
f(x)=3×x×xf(x)=3\times x\times xf(x)=3×x×x
f(x)=3×x×x×xf(x)=3\times x\times x\times xf(x)=3×x×x×x
Type a concept, like “slope” or “photosynthesis”.
