2 replies to this topic

[kennam]

http://www.flickr.co...N02/8006121478/


The question is given above. Now, I don't want to solve by forming 2 linear equations.
e.g 271x - 62y = -30 ......(1)
-62x + 62y = 10 .......(2)

I don't want that...

What i need is just to key in the value into my casio fx-570es. and I can find the answer without listing out the equations.

Thanks so much. Your help with this simple question will be great when I'm dealing with 3 or more unknowns. In exam, I just don't have the time to solve it manually.

[flyingfisch]

Hello kennam and welcome to UCF! You should introduce yourself.

Don't know if this is possible or not... Does the 570es have an equation editor mode?

[MicroPro]

Hi! I don't have a 750 at hand, but there is its manual.

If you want to do direct matrix calculations, you should use its Matrix mode. For example save [271 -62; -62 62] in MatA and [-30; 10] in MatC. Then calculate MatA^-1 × MatC for the answer, which is inverse of MatA times MatC.

If you try the above steps, you'll see it will be more time consuming than forming the equations. I think fx570 can't solve simultaneous equations directly, does it?

If it doesn't, an easier solutions can be forming the two equations on paper, then calculate y out of one of the equations and put the result in the other one and easily solve the resulting x-dependent equation with the calc's Equation mode.