we use the formula y = mx + b where m is the slope and its the number multiplied by x, any other number is the y-intercept
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Masssage the equation around until you have it in the form: Y = Ax + B, 'A' and 'B' are numbers. Once you have it in that form, 'A' is the slope of the line, and 'B' is the y-intercept.
When y = 7x +4 the y intercept is 4 and the slope is 7
In the equation y = mx + b the slope is m and the y-intercept is b. The slope of the line is how "steep" the line is, and the y-intercept is where it crosses the y axis.
A line with a y-intercept but no x-intercept will be a straight line parallel to the x axis. It will have a slope of zero.
Slope=0 Y-intercept=0