1) The value of the expression x + y is; 30
2) The value of the expression m + n is; 16
How to solve Algebraic Expressions?
1) We are told that segments LJ and A F are perpendicular. This means that; 4x + 50 = 90 and 7y - 50 = 90
Let us solve for x and y;
4x + 50 = 90
4x = 90 - 50
4x = 40
x = 10
Similarly;
7y - 50 = 90
7y = 90 + 50
7y = 140
y = 140/7
y = 20
Thus;
x + y = 10 + 20
x + y = 30
2) We are told that LJ is a perpendicular-bisector of A F. Thus;
AJ = FJ and AL = FL
Thus;
FL = AL gives;
3m = 42
m = 42/3
m = 14
Similarly;
2m + 3n = 34
2(14) + 3n = 34
28 + 3n = 34
3n = 6
n = 2
m + n = 14 + 2 = 16
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