Answer:
x is the independent variable
y is the dependant variable
-3 is the rate of change (otherwise known as gradient or slope)
-7 is the initial value
Step-by-step explanation:
The dependant variable is the variable which is determined by the value of the independent variable;
So, if we say x = 1, then the value of y is as follows, y = -3(1)-7 = -10;
The independent variable is (practically) always the x-values and the dependant variable is (practically) always the y-values.
Conventionally, the independent variable, on a graph, is on the x-axis and the dependant variable is on the y-axis.
The rate of change/gradient, in the case of line equations, is simply the coefficient of x, which is just the number that appears before "x" in the equation, i.e. -3.
The initial value is found simply by setting x = 0, and calculating the value of y;
This will always be the number in the equation that is not the coefficient of x, i.e. the number added or subtracted in the equation, -7 in this case.
