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Solve the following systems by substitution method:
–5r + 14t = 13
-9r = -72t

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Mlcparra16id
We simplify the second equation:
-9r=-72t
r = 8t
We express r in terms of t in the first equation:
-40t + 14 t = 13
26t = 13
t = -0.5

Since r = 8t, r = -4