What types of situations might be modeled with equations containing two or more variables? if the value of one variable changes, must the value of the other variable change for the equation to remain true? how would the number of solutions for an equation with two variables differ from the number of solutions for an equation with only one? explain.

Equations containing two or more variables are used to model situations where two or more unknown values need to be determined. For example, if a car manufacturer manufacture a new car model and want to track its costs and revenues, he can use equations with two variables to do this. A system of linear equations which consist of two or more linear equations [depending on the variables to determined] made up of two or more variables, so that all equations in the system are considered simultaneously can be used for this kind of situation. 

Hope this helps.

Good luck!

-RxL

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3