How do you find an equation if you only a have a graph. Like, its already graphed??
If it is a graph of a line then check the point on the y axis where it cuts call it c(include the negative sign if cutting negative y axis)
Locate any to points on the line and find the gradient(m)
so the equation is y = mx + c
To find an equation of a graph when you only have the graph itself, you need to follow a few steps. Here's how you can do it:
1. Identify the type of function: Look at the overall shape and pattern of the graph. Is it a straight line? Does it have a curve? Identifying the basic type of function will help you select the appropriate equation.
2. Determine the slope (if applicable): If the graph represents a straight line, you'll need to find the slope. Pick two points on the line, and use the formula "slope = (change in y)/(change in x)" to calculate the slope.
3. Identify key features: Observe any coordinates where the line intersects the x or y-axis, known as x-intercepts or y-intercepts. These points are beneficial in determining the values in the equation.
4. Write the equation: Once you have identified the type of function, slope (if applicable), and key features, you can write the equation. If it's a linear equation, the general form is y = mx + b, where "m" is the slope and "b" is the y-intercept. For a quadratic equation, it is typically in the form y = ax^2 + bx + c, with "a," "b," and "c" representing coefficients.
Remember that finding the exact equation from just a graph might not always be precise since the graph can sometimes be an approximation. The equations you derive from the graph will be the closest representation based on your analysis.