Question 282270
X+2Y=6
y=2X+3

replace value of y from second equation into first.

x + 2(2x + 3) = 6

x + 4x + 6 = 6

5x = 0

x = 0

putting x =0 in equation 2

y = 2(0) + 3
y = 3

so solution is (0,3)