MHB Please, help with system of equations

Nikolas7
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Please, help with system of equations:
f(x,y)=(5,-2)t+(1,1)
g(x,y)=(-15,6)t+(-2,2)
 
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What have you tried? Where are you stuck?
 
Even more, what do you want to do? You have two functions from R to R^2, f(t)= (5t+ 1, -2t+ 1) and g(t)= (-15t- 2, 6t+ 2). (Those are not "f(x,y)" and "g(x,y)".) What do you want to do with them? What is your question?
 
Thread 'Derivation of equations of stress tensor transformation'
Hello ! I derived equations of stress tensor 2D transformation. Some details: I have plane ABCD in two cases (see top on the pic) and I know tensor components for case 1 only. Only plane ABCD rotate in two cases (top of the picture) but not coordinate system. Coordinate system rotates only on the bottom of picture. I want to obtain expression that connects tensor for case 1 and tensor for case 2. My attempt: Are these equations correct? Is there more easier expression for stress tensor...

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