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x + y = 139
x - y = 29
--------------- +
2x = 168
x = 168/2
x = 84
cari y
x - y = 29
84-y = 29
84-29 = 55
y = 55
2) 9x + 8y = 85
3x + 5y = 40
18x + 16y = 170 [x2]
18x +30y = 240[x6]
-------------------- -
-14y =-70
y = -70/-14
y = 5
substitusi
3x + 5(5) = 40
3x + 25 = 40
3x = 40-25
3x = 15
x = 5
3) perkalian pembagian didahulukan
(5x5)+5-(5÷5)
25+5-1
= 29
4) (90÷1,5x1,25) +90 + (1x0)
60 x 1,25 + 90 + 0
75 + 90 + 0
= 165
5) (99x0)+(51÷3)+44-(90x0)
0 + 17 + 44 -0
= 61