In the straight line equation for example of: y = 3x+6 it is 6 that is the y-intercept and cuts through the y axis while 3 is the slope of the line.
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It shows the relationship of y in terms of x. [y = (yIntercept) + ((slope)*(x))] [slope = (y2 - y1)/(x2 - x1)]
Without the inclusion of an equality sign and not knowing the plus or minus values of the given terms it can't be considered to be a straight line equation
It depends on the context. It could mean 4 times d, or it could mean 4D - four-dimensional.
it could mean negative 30 derees, negative 30 etc. you would need the context
Depending on the context, BMI could mean Body Mass Index. It is a rough measure of whether or not a person is overweight (or underweight) and is calculated as the mass (in kilograms) divided by the square of the height (in metres). A BMI of 30 is the borderline between overweight and obese.