From (1) let's solve for x:
[tex]\begin{gathered} \text{Add 5y to both sides:} \\ x=6+5y\text{ (3)} \end{gathered}[/tex]Replace (3) into (2):
[tex]\begin{gathered} 3(6+5y)+4y=18 \\ 18+15y+4y=18 \\ \text{Subtract 18 from boths sides:} \\ 19y=0 \\ y=0 \end{gathered}[/tex]Replace the value of y into (3):
x = 6 + 5(0) = 6 + 0
Therefore, the solution is:
x=6 , y = 0
The solution fall in the first quadrant (I quadrant)
