Can somebody show I how to rewrite these four equations as matrix equation to enter into a calculator Ti84. I think I support to seperate something first into two different parts before input into a calculator but

don't know what to seperate nor how many row or column.

eq1: NAB+0.1NABcos(15)+0.1=0

eq2: NABcos(15)-0.1NABsin(15)+NC=0

eq3: -3000+.2NB+0.2NABcos(15)+NABsin(15)-ND=0

eq4: 0.2NAB+NABcos(15)+0.2NB=0

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