The x intercept is where y = 0, on the x-axis. So plug in y=0 to you equation:
-5(x) + 20(0) = 20 ... -5(x) = 20...
Divide each side by -5: x = 20/-5 = -20/5 = = -4.
Therefore the x intercept is where y = 0 and x = -4 --> (-4, 0)
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It is a straight line with gradient -A/B and intercept C/B.
-2x plus 3y equals 1
3
7
The lines are parallel.