After
2009
2009 the sales of new cell phones without cameras began declining. The number of people y (in thousands) who bought a cell phone without a camera can be estimated by the equation
y=−30x+270
y=-30x+270, where x is the number of years after 2009
a) Find the x-intercept as an ordered pair
To find the x-intercept, we need to set y equal to zero in the equation y = -30x + 270 and solve for x.
0 = -30x + 270
To isolate x, we can subtract 270 from both sides of the equation:
-270 = -30x
Next, we divide both sides of the equation by -30:
-270 / -30 = x
Simplifying the expression on the left:
9 = x
Therefore, the x-intercept as an ordered pair is (9, 0). This means that it is estimated that the sales of new cell phones without cameras will reach zero (or decline to zero) in the year 2018 (9 years after 2009).