Solve System of equations using Substitution :
X + Y = 175
20X + 16Y = 3,101

The correct answer is: x = 75.25 ; y = 99.75

Ans :- x = 75.25 ; y = 99.75
Explanation :-
y  + x = 175 ⇒  y = 175 - x— eq 1
20x + 16y = 3,101—- eq 2
Step 1 :- find x by y = 175 - x in eq 2.
20x + 16(175 - x) = 3,101 ⇒ 20x - 16x + 2800 = 3,101
⇒  4x = 3101 - 2800  ⇒ 4x = 301
⇒ x  = 75.25
Step 2 :- substitute value of x and find y
⇒ y = 175 - 75.25 ⇒  y  = 99.75
∴  y = 99.75
∴   x = 75.25 and  y  = 99.75is the solution of the given pair of equations.