Quotient of Polynomial Ring by this monomial ideal

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I am trying to understand this statement regarding Stanley-Reisner rings. Basically my question boils down to how do we see/prove that:

$$k[x_1,\dots,x_n]/I_\Delta=k\oplus\bigoplus_{1\leq i\leq n}x_ik[x_i]$$?

Thanks.