They are the coordinates of the infinitely many points on the line defined by the equation.
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These are equations of two straight lines. Provided the equations are not of the same or parallel lines, there can be only one ordered pair. So the ordered pair is - not are : (0.5, -1)
Choose any value for x. Calculate 8x to get the corresponding value for y.
The lines intersect at (3, 5)
8x plus 4y equals 5 is 8x + 4y = 5.
(1, 1)