1177 B.C. (Revised and Updated): The Year Civilization Collapsed

1177 B.C. (Revised and Updated): The Year Civilization Collapsed

Matematika 2x + 4y = 20
4x - y = 4

tentukan x + y ​

2x + 4y = 20
4x - y = 4

tentukan x + y ​

Nilai x + y adalah 6

Pembahasan

2x + 4y = 20 … pers (1)

4x - y = 4 → y = 4x - 4 … pers (2)

Substitusi y ke pers (1)

          2x + 4y = 20

2x + 4(4x - 4) = 20

 2x + 16x - 16 = 20

         18x - 16 = 20

                18x = 20 + 16

                18x = 36

                    x = ³⁶⁄₁₈

                    x = 2

Substitusi x ke pers (2)

y = 4x - 4

y = 4(2) - 4

y = 8 - 4

y = 4

Nilai x + y

= x + y

= 2 + 4

= 6

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