Updated and functional unit test and function for 2d_line exercise

Author: aris134

2d_line.py

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+
+def find_eqn_2d_line(input_coords):
+    # INPUT: [(x1, y1), (x2, y2)]
+    # OUTPUT: m = slope, b = y-intercept
+    m = (input_coords[1][[1] - input_coords[0][1]) / (input_coords[1][0] - input_coords[0][0])
+    b = input_coords[0][1] - m * input_coords[0][0]
+    return (m, b)
+    
+def find_y_from_x(m, b, x):
+    # INPUT: m, b, x
+    # OUTPUT: y = m*x + b
+    y = m*x + b
+    return y

line_2d.py

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+
+def find_eqn_2d_line(input_coords):
+    # INPUT: [(x1, y1), (x2, y2)]
+    # OUTPUT: m = slope, b = y-intercept
+    m = (input_coords[1][1] - input_coords[0][1]) / (input_coords[1][0] - input_coords[0][0])
+    b = input_coords[0][1] - m * input_coords[0][0]
+    return (m, b)
+    
+def find_y_from_x(input_line_x):
+    # INPUT: m, b, x
+    # OUTPUT: y = m*x + b
+    y = input_line_x[0]*input_line_x[2] + input_line_x[1]
+    return y

test_line_2d.py

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+
+def test_find_eqn_2d_line():
+    from line_2d import find_eqn_2d_line
+    
+    input_coords = [(1, 8), (4, 14)]
+    (m, b) = find_eqn_2d_line(input_coords)
+    
+    assert m == 2
+    assert b == 6
+    
+def test_find_y_from_x():
+    from line_2d import find_y_from_x
+    
+    input_line_x = (2, 6, 8)
+    y_result = find_y_from_x(input_line_x)
+    
+    assert y_result == 22