Question 1208845
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8x+y = 4 solves to y = -8x+4


It's of the template y = mx+b
m = -8 = -8/1 = slope
b = 4 = y intercept


Start at the y intercept (0,4)
Move down 8 units and right 1 unit (due to the slope) to arrive at the point (1,-4)


Plot the points (0,4) and (1,-4)
Draw a straight line through them both. Extend the line as far as you can in both directions. 
{{{
drawing(400,400,-5,5,-5,5,
graph(400,400,-5,5,-5,5,-100,-8x+4),
circle(0,4,0.04),circle(0,4,0.055),circle(0,4,0.07),circle(0,4,0.085),circle(1,-4,0.04),circle(1,-4,0.055),circle(1,-4,0.07),circle(1,-4,0.085),
locate(0+0.2,4+0.2,"(0,4)"),locate(1+0.2,-4+0.2,"(1,-4)")
)
}}}
<a href="https://www.geogebra.org/calculator">GeoGebra</a> and <a href="https://www.desmos.com/calculator">Desmos</a> are two of many graphing tools.
Or you can use something like a TI83.
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