Question 88444
X+Y=28 X=28-Y
Y=X+4 NOW SUBSTITUTE (X+4) FOR Y IN THE FIRST EQUATION & SOLVE FOR X
X=28-(X+4)
X=28-X-4
2X=28-4
X=24/2
X=12 ANSWER.
Y=12+4
Y=16 ANSWER. (12,16)
PROOF
12+16=28
28=28