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Hello,1) the line parallele to ox passing by (1,4) has for equation y=4f(x)=4 if -1<=x<=12) the line pasing through (3,2) and (5,4) has for equation:y-2=(4-2)/(5-3)(x-3)==>y=x-3+2==>y=x-1f(x)=x-1 if 3<=x<=5.
