math
posted by tea .
If 6x  3y= 30 and 4x= 2y then find x+y.

4x= 2y
x = (2y)/4
6x  3y = 30
Substitute (2y)/4 for x in the last equation and solve for y. Put value into first equation to find x. Check by putting both values into the last equation. Add x and y.