Question

the cost c of a car service is partly constant and partly varies with time t it takes to the work .if it costs #5 and half hours service and #29 for a 4 hours services.(a)find the formula connecting the cost c and time t (b)find the cost of a 7 and half hours service

c = at+b
now, just solve
0.5a + b = 5
4a + b = 29
to find a and b,

and then find c(7.5)

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