SOLUTION: solve each system using the substitution method. s+t=-5 s-t=3

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Question 302008: solve each system using the substitution method.
s+t=-5
s-t=3
Answer by london maths tutor(243) About Me  (Show Source):
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s+t=-5 ... equation 1
s-t=3 ... equation 2
Rearrange equation 2:
s-t = 3
s = t + 3
Put s = t+3 into equation 1
(t+3)+t = -5
3 + 2t = -5
2t = -8
t = -4
Put t = -4 into equation 2
s -(-4) = 3
s + 4 = 3
s = -1
Answer: s = -1 and t = -4