3x + 3y = 9 -7x + 5y = 35 tolong bantu ya plis banget

3x + 3y = 9 x 5 15x + 15y = 45
-7x + 5y = 35 x 3 -21x + 15y = 105
__________ ____________ –
36x = -60
x = -60/36
x = 1,6
3x + 3y = 9
3(1,6) + 3y =9
4,8 + 3y = 9
3y = 9 – 4,8
y = 4,2

Semoga membantu

Bab Persamaan Linear
Matematika SMP Kelas VIII

3x + 3y = 9
------------------ : 3
x + y = 3
y = 3 - x

-7x + 5y = 35
-7x + 5(3 - x) = 35
-7x + 15 - 5x = 35
-12x = 35 - 15
x = 20/-12
x = -5/3

y = 3 - x
y = 3 - ( - 5/3)
y = 3 + 5/3
y = 3 5/3
y = 14/3

HP = { (-5/3, 14/3) }