Understanding how to substitute values into an expression is an essential skill when using graphs to estimate values of \(x\) and \(y\). There are no straight-line segments on a quadratic graph.

The graphs of \(y = 2x + 1\) and \(y = 2x - 2\) are shown below. The graph of \(y = 2x + 1\) crosses the \(y\)-axis at (0, 1). The graph of \(y = 2x - 2\) crosses the ...