8x + y = 4
First you have to get the y by itself. So you minus 8x from each side because you need positive y.
New equation: y=-8x+4
Next you need to make some co-ordinates.
So, (-3,28), (-2, 20), (-1, 12), (0, 4), (1, -4), (2, -12), (3,-20)
Plot these on your graph.
I hope this helps
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x=4, y=9 (4,9)
7y+ 8x + 4= 20 + 8x- 8x - 8x7y + 4 = 20- 4 - 47y=16/7 /7y= 2.28the /7 means divide by 7 :)
-14x
x=7 and y=4
8x+4 = 2x+28 8x-2x = 28-4 6x = 24 x = 4