Question

Need to get an idea of how to do these questions for finals could you possibly answer it so I can get a better understanding of the question

Answer 1

`y\text{ = 3x-21}`

Step-by-step explanation:

Here, we want to get the equation of the line

Mathematically, we have the equation of a straight line as:

`y\text{ =mx + b}`

where m is the slope and b is the y-intercept

From what we are given , the slope is 3

To the x-intercept, it is the value of x when y = 0. We can use this to get b

Mathematically, we have that as:

`\begin{gathered} 0\text{ = 3(7) + b} \\ 0\text{ = 21 + b} \\ b\text{ = -21} \end{gathered}`

The equation of the line is:

`y\text{ = 3x-21}`