To check if we have function or not, we apply the vertical line test. This test is where you ask yourself: "Is it possible to draw a single vertical line through more than one point on the curve?"
If the answer to that question is "yes it is possible", then we do not have a function. Graph B shows that we can draw a line through say x = 2 and have the vertical line intersect at points (2,2) and (2,4). The input x = 2 leads to multiple outputs y = 2 and y = 4 simultaneously. This is why graph B is not a function.
A function is only possible when any x input from the domain leads to exactly one y output in the range. Graph A is a function because we cannot draw a single vertical line to intersect through that curve more than once.
5.702 rounded to the nearest unit is 6. Look one decimal place further to determine what to round to. Greater than or equal to 5, round up. Less than 5, keep it the same.
For example, 5.402 rounded to the nearest unit would be 5 because the next decimal point is 4
<h3>How to find the equation of a passing line?</h3>
The equation y = mx often denotes a straight line with a gradient of m that passes through the origin. Y = mx is the equation for a straight line with gradient m that passes through the origin.
Given: and
The slope of the line passing through is
The slope of our line
Slope intercept from the equation would be
Find C:
Since lies on the line, substitute these in the line equation
Therefore, the equation in slope intercept form is
To learn more about the Equation of a passing line, refer to: