book Maths Puzzle Numerical Ability

im graphing A linear equation that involves y = -x + 3 and y = x + 1 and i dont know how to graph it

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solving for x:
13.7b-6.5= -2.3b+8.3
The number of milk cows y(in thousands) on farms in the United States for the year x from 1970 through 1995 (x=0 represents 1980), can be modeled by the linear equation 107x+y=11,0