Question 75654
X+Y=112
X=112-Y
Y=4X+7 NOW SUBNSTITUTE (4X+7) FOR Y AND SOLVE FOR X IN THE FIRST EQUATION THUS:
X+(4X+7)=112
5X=112-7
5X=105
X=105/5
X=21 ANSWER FOR THE SMALLER DIGIT
Y=4*21+7
Y=84+7
Y=91
PROOF
91=4*21+7
91=84+7
91=91
AND 91+21=112