diketahui {2 1} {2-x = (13) nilai dari 5y-2x adalah

21(2-x) = 13
42-21x = 13
-21x = 13-42
-21x = -29
x = -29+21

x = 8

5y - 2x = 0
5y - 2*8 = 0
5y-16 =
5y = 16
y = 16÷5
y = 3 1/5