If r = 3s + 1 and t = s  4, then what is r in terms of t? r = 3s + 1
t = s  4 > s = t + 4 {added 4 to each side} r = 3(t + 4) + 1 {substituted (t + 4), in for s, into top equation} r = 3t + 12 + 1 {used distributive property} r = 3t + 13 {combined like terms}  Algebra House
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