Question 231676
x-y=10 or x=y+10
4x-30=3y+20 now replace x by (y+10) & solve for y.
4(y+10)-30=3y+20
4y+40-30=3y+20
4y-3y=20+30-40
y=10 ans.
x-10=10
x=10+10
x=20 ans.
Proof:
4*20-30=3*10+20
80-30=30+20
50=50