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x = y - 10 -------> persamaan 1
x = 2y + 8 ------> persamaan 2
substitusikan pers 1 ke pers 2
x = 2y + 8
y - 10 = 2y + 8
y - 2y = 8 + 10
-y = 18
y = -18
substitusikan y = -18 ke pers 1
x = y - 10
x = -18 - 10
x = -28
HP = { -28 , -18 }
2.)
x - 2y = 2 <=> x = 2y + 2 -----> pers 1
3y -5x = -24 ----> persamaan 2
substitusikan pers 1 ke pers 2
3y - 5x = -24
3y - 5(2y + 2) = -24
3y -10y -10 = -24
-7y = -24 + 10
-7y = -14
y = -14/-7
y = 2
subatitusikan y = 2 ke pers 1
x = 2y + 2
x = 2(2) + 2
x = 4 + 2
x = 6
HP = { 6, 2 }
3.)
2x + 2y = 5 <=> y = -x + 5/2 ---> pers 1
4x -3y = -18 ----> persamaan 2
substitusikan pers 1 ke pers 2
4x - 3y = -18
4x -3 (-x + 5/2) = -18
4x +3x + -15/2 = -18
7x = -18 + 15/2 (kalikan 2 kedua ruas)
14x = -36 + 15
14x = -21
x = -21/14
x = -3/2
substitusikan x = -3/2 ke pers 1
y = -x + 5/2
y = -(-3/2) + 5/2
y = 3/2 + 5/2
y = 8/2
y = 4
HP = { -3/2 , 4 }
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