Question 225309
<ol><li>Get the equations into "standard" form: Ax + By = C. Your first equation is already in this form. All we need to do with the second is to rewrite it as an addition:
3x + (-4y) = 8</li><li>Then just write the numbers into a matrix, leaving out all the "punctuation" (addition, =, parentheses, etc.):
<pre>
+-            -+
|  1   1   5   |

|  3  -4   8   |
+-            -+
</pre>
(I apologize for the crude matrix "corners".)</li></ol>