Answer:
2x + 2y - 15 = 0
Explanation:
This line pass (7.5,0) and (0,7.5)
ax + by + c = 0
7.5a + 0b + c = 0
0a + 7.5b + c = 0
c = -7.5a = -7.5b
and a = b
ax + ay - 7.5a = 0
x + y - 7.5 = 0
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