Solving multiple formulas using recursion

Question

I have to use recursion to compute the value of the following formulas:

m = 1.4 *t + 1.2*z + 0.8*l + 0.1*o

o = 1.0 *g + 1.3 *g + 1.3 *f + 0.2 *t

t = 0.9*g +