The graph of the equation y=8 is a horizontal line through the y-intercept of 8. This is because since y=8, any point on the graph will have a y-coordinate of 8. This is why it is a horizontal line through (0,8).
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y=-5x+8 the slope is -5.
No, y=8 is a fixed value. A linear equation would look something like y=x+8 - That would produce a straight line graph if the values of x & y were plotted against each other on a graph.
10
They are the same equation just written differently so they are both easy to graph.
The graph shifts downward (negative y) by 9 units.