Question 1038594
.
<pre>
 a +  4b =  7,   (1)
3a + 12b = 20.   (2)

This system has no solution.

Note that the left side of (2) is 3 times the left side of (1),
while right sides are not in this proportion.
</pre>

See the lesson <A HREF=https://www.algebra.com/algebra/homework/coordinate/lessons/Geom-interpret-of-the-lin-system-of-two-eqns-with-two-unknowns.lesson>Geometric interpretation of the linear system of two equations in two unknowns</A> in this site.