Answer:
36/23
Explanation:
You want the value of y in the solution to the system of equations ...
Substitution
Since we only want the y-value, it is convenient to eliminate x using substitution. The second equation gives an expression for x that can be used in the first equation:
5(5 -3/2y) -4y = 7
25 -15/2y -4y = 7 . . . . eliminate parentheses
50 -15y -8y = 14 . . . . . multiply by 2 to eliminate fractions
36 = 23y . . . . . . . . . . . add 23y-14
y = 36/23 . . . . . . . . . . divide by 23