Question

Nillai Y yang memenuhi SPNLDV
{1/x + 1/y =4
{2/x - 3/y = -7

adalah...
a. 3
b. 1/3
C. - 1/3
d. -3..

jelaskan pakai cara

Answer 1

Misal :
1/x = m
1/y = n

{m + n = 4
{2m - 3n = -7

{2m + 2n = 8
{2m - 3n = -7
____________ -
5n = 15
n = 15/5
n = 3

1/y = 3/1
3y = 1
y = 1/3