Don't have Telegram yet? Try it now!
https://jjthetutor.com/t-r2-to-r3-tx_1x_2-3x_1-3x_2-x_13x_2-3x_1-7x_2-find-x-such-that-tx1-2-3/
T : R2 to R3 T(x_1,x_2) = (3x_1-3x_2, -x_1+3x_2, 3x_1-7x_2) Find x such that T(x)=(1, 2, 3)