Answer:x=5/4
Explanation:
3x + 3y = 4
x - 3y = 1
shift unwanted numbers to the other side
x=1+3y
3y becomes + because the negative- changes to + plus when being shifted to the other side.
Above given x is 3
combined the two equations Put 3 in x
[3(1 + 3y) + 3y = 4]
3x1 + 3x3y +3y=4
3+9y +3y=4
3 + 12y=4
12y= 4-3
12y=1
y=1/12
bring back the top formula
x=1+3y
x=1+3/1/12
3x 4=12
x=1+4/4
x=5/4