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Answer: y = 3x - 2
Step-by-step explanation:
gradient = (4 - 1)/(2 - 1) = 3/1 = 3
y = 3x + c needs to work for both points
Substitute (1,1) into equation
1 = 3 x 1 + c
c = 1 - 3 = -2
y = 3x - 2