they have same slop.then two linear equations have infinite solutions
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The equation 2x - 3y = 6 is a linear equation and a linear equation is always has a straight line as a graph
It would look like a straight vertical line, i.e. parallel to the y-axis, passing through the point on the x-axis where x=3.
I suggest you use an online graphing calculator to do this. For example, you might try Wolfram Alpha.
'x^(2)' looks like a bowl on a graph. '-x^(2)' looks like an upturned bowl, or an umbrella.
Taking the x-axis to represent degrees C and the y-axis for K, it would be a straight line, parallel to y = x and with intercept (0, -273.15). The graph would not cross the y-axis.