Find the equation

Find the equation of the line y = mx + c for:

1. Gradient 2, y-intercept 5
2. Gradient -1, passes through (0, 4)
3. Passes through (2, 3) with gradient 4
4. Passes through (1, 2) and (3, 8)
5. Passes through (-2, 1) and (2, -3)
6. Horizontal line through (5, 7)

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