Question 856615
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
doing the Graphing First
y = 2x+3 green  p(0,3) and P(3,9) Plot, connect with line
y = 3x-6 blue   P(0, -6) and P(2, 0) Plot, connect with line
Line intersect at(9,21), x = 9,  y = 21 the solution
{{{drawing(300,300,   -25,25,-25,25,grid(1), 
circle(0, -6,0.8),
circle(0, 3,0.8),
circle(2, 0,0.8),
circle(3, 9,0.8),
circle(9, 21,0.8),
graph( 300, 300, -25,25,-25,25,0,  2x+3, 3x -6) )}}}
Let's see
15x - 5y = 30
<u> 2x - y = -3</u>  Multiply by 5 and subtracting from 1st EQ to eliminate y
     5x = 45
      x = 9  and using y = 2x+3,  y = 21