Question

Nilai x yang memenugi sistem persamaan linier dua variabel

4x + 5y = 7
3x - 2y = -12

Adalah

Answer 1

4x + 5y = 7 l x3
3x - 2y = -12 l x4

=>
12x+15y=21
12x-8y= - 48
kurangkan
23y = 69
y = 69/23
y = 3

4x + 5y = 7
4x + 5(3)=7
4x + 15 = 7
4x = 7-15
4x = -8
x = -8/4
x = -2

jadi x = -2