Multiplying a function by -1 will make it a reflection of the original function across the x axis.
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The function will remain unchanged. Therefore, the graph will also remain unchanged.
The graph of the function y(x) = 1/x is a hyperbola.
I don't understand your question but y=3x is the function of a graph, to graph the function you would plug points into the function such as x=0, x=1, x=-1 and you would find the y values at each point so that you can graph it. In this case the graph is a parabola which has a u shape.
If a > 0, it is stretched, in the vertical direction, by the factor a If a = 1 it is unchanged If 0 < a < 1, it is shrunk bt the factor a If a = 0, it is coincident with the x-axis If a < 0 then as above, but it is also reflected about the x-axis (turned upside down).
y=x+1
The linear parent function is y=x. The line on a graph passes through the origin(0,0) with a slope of 1. The line will face left to right on the graph like this /.