# Write an equation of the line shown in the graph calculator

## Graphing calculator

Can we still find the slope and y-intercept? Find the general equation of the line. Graphs are used because a picture usually makes the number facts more easily understood. Again, in this table wc arbitrarily selected the values of x to be - 2, 0, and 5. This gives us a convenient method for graphing linear inequalities. Substituting into Equation 1 yields Note that we get the same result if we subsitute -4 and 2 for x2 and y2 and 3 and 5 for x1 and y1 Lines with various slopes are shown in Figure 7. The definition might not seem totally clear but if we look at an example equation we will have fewer problems with understanding. This is called an ordered pair because the order in which the numbers are written is important. Calculate the slope of the line through your two points rounded to three decimal places. A linear equation graphs a straight line. This is great for graphing , and can be quite useful for word problems.

First we know that the solutions to an equation do not change if every term of that equation is multiplied by a nonzero number. Since the solution 2,-1 does check. Procedures To sketch the graph of a linear equation find ordered pairs of numbers that are solutions to the equation. It is often convenient to use a special notation to distinguish between the rectan- gular coordinates of two different points. Let's hope that means you were inside the car, and not under. In this section we will discuss the method of substitution.