If the question was: y-2x = 18 then the y intercept is 18
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y=2x+4 is in slope intercept form
Transform the equation into slope-intercept form: y = mx + b. The intercept is b. 5x - 4y = 18 -4y = 18 - 5x 4y = 5x - 18 y = 5x/4 - 18/4 so the y-intercept is -18/4 or -4.5
If you mean y = 2x-2 then it is a straight line equation whereas the slope is 2 and the y intercept is -2 and its coordinates would be plotted on the Cartesian plane.
The x-intercept would be 4x + 9(0)= 18 so x = 4.5 (4.5,0) the y-intercept you'd make the x=0. 4(0) + 9y = 18 so y=2 (0,2)