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Verified answer
Bab : Persamaan Linear Dua VariabelKelas : VII SMP
x + y = 1 ....... 1) => x = 1 - y
x³ + y³ = 19 ... 2)
x³ + y³ = 19
(1 - y)³ + y³ = 19
1 - 3y - y³ + y³ = 19
-3y = 19 - 1
y = 18/-3
y = -6
Subs . nilai y ke pers . 1
x + y = 1
x + (-6) = 1
x - 6 = 1
x = 1 + 6
x = 7
maka x² + y²
=> 7² + (-6)²
=> 49 + 36
=> 85