Answer:
x + 4y = 7
Explanation:
Slope: (2-1)/(-1-3) = 1/-4 = -1/4
y = (-1/4)x + c
1 = (-1/4)(3) + c
c = 1 + (3/4) = 7/4
y = (-1/4)x + 7/4
4y = -x + 7
4y + x = 7
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