8x plus 4y equals 5 is 8x + 4y = 5.
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8x+4y=20 4y=-8x+20 y=-2x+5 f(x)=-2x+5
-8x + 4y = 28 Add 8x to each side: 4y = 8x + 28 Divide both sides by 4: y = 2x + 7
x=4, y=9 (4,9)
If 8x + 4y = 16, then y = - 2x + 4 Thus the slope is -2 and the intercept is 4.
This can't be solved. You have two varibles.