find the exponential equation using simultaneous equations - please show all working out

using simultaneous equations and the points below find the constant values of a, b, hand uin the function : y = abarth (exponential ) x y sc-h y = ab + k 0 0 .055 10 0 . 04 8 20 0 . 042 exponential function must model data 30 0. 037 40 0.033 50 0. 029 60 0.026 70 0. 024 80 0. 022