y=4x+3
then plug it into the other equation
9x+3(4x+3)=21
9x+12x+9=21
21x+9=21
21x=12
x=12/21
then plug that into the original equation to find y
{2y =8x+6
9x+3y=21
2 answers
Y = 19/28
9x+3y=21
2 answers