Question

jackson started with $800 in his savings account, but has to pay $30 a month for his electricity bill. which equation relates his savings, y, to the amount of months, x? y = 30x - 800 y = -30x + 800 y = -30x y = 12x - 30

Explanation:

Step1: Identify the initial amount

The initial savings is $800$, which is the y - intercept ($b$) in the linear equation $y = mx + b$.

Step2: Determine the rate of change

He pays $30$ per month, so the amount of savings decreases by $30$ each month. The slope ($m$) is $- 30$.

Step3: Form the linear equation

Using the slope - intercept form $y=mx + b$, substitute $m=-30$ and $b = 800$. So the equation is $y=-30x + 800$.

Answer:

B. $y = - 30x+800$