This is hard to graph via wiki, but first you must solve for y. Therefore,
y = 2x + 5
5 is the y-intercept, which means at the point (0,5), you should make a dot. The slope is 2, or 2 over 1. At the dot you just made, move up two spaces, and then to the right one space. Make another dot. Use a ruler to connect the two dots.
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If you mean: y = 2x+5 then it is a straight line equation.
5
The equation y = 4x^2 + 5 is a parabola
y=-5x+8 the slope is -5.
There is no y-intercept or slope for this given equation, because its graph is a vertical line perpendicular to the x-axis.