Use the method of subsititution to solve the system of linear equations. -r + 10t = 22 -10r + 5t = 30
from the first equation you get r = 10t-22 substitute this expression instead of r in the second equation giving you -10(10t-22)+5t =30 solve for t. once you have t, r is 10t-22
solve for r and plug in second equation and then you will find t once you find t then plug in t's answer to original equation so you can find r
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