title: Line plot of multiple variables in R
body: <p>I have input data in below format.</p>
  
  <pre><code>  x      y       z
    0      2.2     4.5
    5      3.8     6.8
    10     4.6     9.3
    15     7.6     10.5
  </code></pre>
  
  <p>How can i plot the xy scatter plot like excel (show below) in R?</p>
  
  <p><img src="https://i.stack.imgur.com/qAC9x.png" alt="enter image description here"></p>