Use your knowledge about parentheses and substitution to solve the following: 1. r(s)(t) =

2. (r)(s)(t)(x)(y) =

3. (7x + 2Y) =

what grade you in

your answer 3x+y

Step-by-step explanation:

3x+y

x

​  

=−3

=−y+3

3x+y

3(−y+3)+y

−3y+9+y

−2y

y

​  

=−3

=−3

=−3

=−12

=6

​  

Step-by-step explanation:

Hope this helps!

step-by-step explanation:

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