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A linear relationship will show up on a graph as a straight line.
A linear equation looks like any other equation. It is made up of two expressions set equal to each other. A linear equation is special because: It has one or two variables. No variable in a linear equation is raised to a power greater than 1 or used as the denominator of a fraction. When you find pairs of values that make the linear equation true and plot those pairs on a coordinate grid, all of the points for any one equation lie on the same line. Linear equations graph as straight lines.
The graph of an equation is all of the answers that are true for the equation. A variable is an unknown number in an equation. Most equations are written with x and y variables. There are an unlimited amount of numbers that the variables can be to have the equation be true, so you would graph the equation to show the unlimited amount of numbers that make the equation true.
The link will show you several different kinds of graph. A straight line graph will literally be one straight line, representing a linear equation perhaps, or showing the closest straight line fit to a set of data. There are other line graphs that connect points on a grid with straight lines, even though the over-all graph may not be one single straight line. Graphs are very interesting and extremely useful. You can often find a straight line that is the 'best fit' for some data, but there may be other kinds of curved lines that are even better fits.
In an inequality, you have to shade a side of a line to see show if the possible answers are greater than or equal to it