3x + 2y = 13
Subtract 3x from each side:
2y = -3x + 13
Divide each side by 2:
y = (-3/2)x + (13/2)
The graph is a straight line, with a slope of (-3/2),
through the point (0, 13/2) .
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Same way you graph y = -4x - 0.5
The lines are parallel.
I guess you mean 4x + 2y = 12 is changed to 4x + 2y = 36. The graph is translated (shifted) up the 7 axis by 24.
(3, -4)
x+2y=13 has infinite answers, because you have two variables and only one equation.