The 4 is closer to the decimal point than the 7 is, so 0.0004 is a greater number.
y = 1 - 3x goes to slope -3, y-intercept at 1
x - 3 = y goes to slope 1, y-intercept at -3
y = 3x - 1 goes to slope 3, y-intercept at -1
-x + 3 = y goes to slope -1, y-intercept at 3
Notice that the two minus signs cancel out, so 12-(-5) is equivalent to 12+5. This sum is clearly 17.