Help, Linear Algebra!!?

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ok question take-home linear algebra exam.
unfortunately, not here when learned information, , not can't find anywhere in textbook it. suggestions?

if s stretching transformation on r^2
s(x,y) = (7x,7x) , t transformation on r^2 defined
t(x,y) = (2x+3y, 7x-5y) s , t commute?


prove answer correct.

ok question take-home linear algebra exam. unfortunately, not here when learned information, , not can't find anywhere in textbook it. suggestions? if s stretching transformation on r^2 s(x,y) = (7x,7x) , t transformation...


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