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Persamaan Linier

3x + y= 5
x - y = - 1
jumlahkan
4x = 4
x= 1

x - y = - 1
y = x + 1
y = 1+1
y = 2

2a x - by = 8
2a(1) - b(2)= 8
2a - 2b = 8
2 ( a- b) = 8
a - b = 4

5.
3x² + 2y² = 28 .....(1)
.
x√3 + y√2 = 10 atau x √3= 10 - y√2
(x√3 )² = (10 - y√2)²
3x² = 100 - 2y² - 20 y√2 substitusikan ke pers (1)

100- 2y² - 20y√2  + 2y² = 28
100 - 20y√2  = 28
20 y√2 = 100 - 28 = 72
y = 72/(20√2)
y = 9/5 √2

x√3 + y√2 = 10
x√3 + (9/5)√2 (√2) = 10
x√3 + 18/5 = 10
x√3  = 6,25
x = 6,25 /√3