No one single point corresponds to y = 7 - x, but a whole straight line of them do.
eg the points (0, 7), (1, 6), (1.5, 5.5), etc all do.
It is the line of gradient -1 that crosses the y axis at 7 (and the x-axis at 7).
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y = -7x 0 = -7x 0 = x x-intercept point is (0, 0).
(6,5)
7
7x + y = 6 y = 6 - 7x dy/dx = 0-7 = -7 Slope = -7
7