SOLUTION: RS=4y+2,ST=3y+9,and RT=11y-21

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Question 1184910: RS=4y+2,ST=3y+9,and RT=11y-21
Answer by MathLover1(20849) About Me  (Show Source):
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RS=4y%2B2
ST=3y%2B9+
RT=11y-21
R____________S_______________T
RS%2BST=RT
4y%2B2%2B3y%2B9=11y-21
7y%2B11=11y-21
21%2B11=11y-7y
32=4y
32%2F4=y
y=8
RS=4%2A8%2B2=34
ST=3%2A8%2B9=33+
RT=11%2A8-21=67