1. Which angles in the picture are NOT supplementary A. 2 and 3; 1 and 4
B. 4 and 1; 3 and 4
C. 1 and 3; 2 and 4
D. 1 and 2; 2 and 3

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

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[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?