1. The problem statement, all variables and given/known data Elementary I know but could I please get some help solving the following four equations. It's simple calculus but I'm getting nowhere with what I have done!! Solve for T1, T2, a1, a2 2. Relevant equations m2g-T2 = m2 (a1-a2) m3g-T2 = m3 (a1+a2) T1-T2 = 0 T1-μm1g = m1a1 (note that the the numbers after a and t are not numerical values. Just to show that the T1 has a different value for T2 etc. ) 3. The attempt at a solution So I have tried combining equations m2g-T2 = m2 (a1-a2) m3g-T2 = m3 (a1+a2) and ended up with g = a1- a2(m2+m3)/(m2-m3) After that I just can't figure out what to do next! any suggestions?