slope means the difference in the y-values over the difference in the x-values.
y-intercept means the point at which the graph goes through the y-axis.
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There is no slope nor intercept because there is no equation, simply an expression.
first of all, i dont see how slope and yintercept has anything to do with shopping. usually in an equation, y= mx+b, m stands for slope, and b is the y-intercept. x and y are just x and y. If the equation is mixed up, and is not in y=mx+b format, you need to solve to get y on one side, the slope, x, and whatever the presented constant is (which is the y-intercept) on the other side. hope this helps.
X=5 is a vertical line, so it has no slope. When I say it has no slope, I don't mean the slope is 0, I mean the slope is nonexistent.
If you mean y = 11x then the slope is 11
If a line has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'