It would be shifted down
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Well, honey, if you change that "+ 7" to a "+ 2" in the equation y = 12x + 7, you're just shifting the whole graph down by 5 units. So, the new function y = 12x + 2 will be parallel to the original, but sitting a little lower on the graph. It's like giving your graph a little makeover - same shape, different outfit.
it would be shifted up
It would be less steep
It is a reflection of the original graph in the line y = x.
If you mean y = x+5 changed to y = x+9 then the lines will be parallel to each other but with different y intercepts.
A bar graph would be the best graph or chart to use to compare and contrast information.
Test it by the vertical line test. That is, if a vertical line passes through the two points of the graph, this graph is not the graph of a function.