algebra
posted by Donna .
I need to know if I am doing this problem right when sustitution method.
y+2x=3
y+2x=4
y+2x=3 1(y+2x=3)y2x=4
now add the two equation
y2x=3
y2x4
the answer would be 4y=7
then divided 4=7 answer 1.75
I no that there is more to this answer I am just stuck and not sure if this is right are not.

You are not doing substitution.
y = 3  2x
y + 2x = 4
Substitute 3  2x for y in second equation and solve for x. Insert that value into the first equation and solve for y. Check by inserting both values into the second equation.