How do you solve this system of equations?

shanemcguffin

Solve for a

T - mg = -ma
T = Ma

They get a = mg / (M + m)...how?

I get up to this point... Ma + ma = mg

trollcast

Quote by shanemcguffin

Solve for a

T - mg = -ma
T = Ma

They get a = mg / (M + m)...how?

I get up to this point... Ma + ma = mg

Factorise out the a term on the left side.

a(M+m)=mg
a=mg/(M+m)

shanemcguffin

Thank you!

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shanemcguffin	How do you solve this system of equations? Solve for a T - mg = -ma T = Ma They get a = mg / (M + m)...how? I get up to this point... Ma + ma = mg