Inputting Uneven Equations on the TI-89 Calculator?

[Holmez]

I have problems with finding out how i can insert these three equations:

into the TI-89 calcualtor, so i get the 3 answers in the bottom of the picture. I know how to do it if the 3 equations have the same amount of parts/sections, but like you see here the fir equation has 2 parts, but the 2 others have 3 parts. I use the program called Simultaneous Eqn Solver on my TI-89.

 

[HallsofIvy]

Actually, each equation has four parts:
$$0F_{ax}+ 0F_{ay}+ \frac{8}{\sqrt{20}}F_c+ \frac{800(16)}{\sqrt{20}}= 0$$
$$1F_{ax}+ 0F_{ay}+ \frac{-2}{\sqrt{20}}F_c+ \frac{800(4)}{\sqrt{20}}= 0$$
$$0F_{ax}+ 1F_{ay}+ \frac{4}{\sqrt{20}}F_c+ \frac{800(2)}{\sqrt{20}}= 0$$

By the way, 800(16)= 12800, 800(4)= 3200, 800(2)= 1600, and $\sqrt{20}= 2\sqrt{5}$.

Calculators are good for doing tedious arithemetic. Don't expect them to do your thinking for you! These are close to being trivial to do by hand and it would be good practice. Solve the first equation for $F_c$, then put that value into each of the other equations.

 

[Holmez]

thanx for the help :)
My teacher says that we should input it into a calclator, so we don't need to solve the equations manualy.

i got it to work now when i inputed the equations the way you wrote them :)