MathCad set of linear equation solution error (don't work)

[LB_9743293]

Hi, guys im trying to solve this equation and get the value of coefficients (alpha1,2,3) and it doesn't work. Do you have and suggestions on how to solve this? I would like to use it in the future, so it should be parametric. I attached a screenshot and file. Thanks.

https://imgur.com/2wQE0L0

[Werner_E]

If you want a quantity "f" to be depend on variables "x" and "y" you have to define a function -> f(x,y):=....

If you use symbolic quantities you can't evaluate numerically (the normal "="). You may evaluate symbolically (the right arrow "->" you get by pressing Ctrl .)

I also wonder why you define variables with units just to make all expressions thereafter unitless !?

The attached sheet is not working as you expect, but should give you a starting point.

[LB_9743293]

Oh, I see. Im going to check it out thank you. I want to use units but I was searching for error and I thought that is going to be a problem with units compatibility. Thank you.