exam Maths Puzzle Numerical Ability

how do you find f(x)=ax+b in which f(2)=1 and f(-3(=11?
from mathematics for the international student:Mathematics SL-section 1c

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a store has prevoiosly sold a tv for 21 dollars but has been reduced to 17.43. The price reduction, rounded to the nearest whole percent A market vendor wants to mix the liver and the gizzards of chickens to have 40 kilograms of assortment worth 120.00 per kilogram. The liver costs 110.00 per kilogram while the gizzard costs 75.00 per kilogram. How much each kind must be mixed?