Ana membeli 3 peniti dan 4 benang dg harga Rp2.050,00 . Sedangkan anti membeli 1peniti dan 3 benang dg harga Rp.1.350,00 harga 10 benang dan 5 peniti adl

dik:
3x + 4y =2.050
x + 3y = 1.350

* x = peniti
y = benang

dit:
10y + 5x = ???

jawab:
x + 3y = 1.350
x = 1.350 - 3y

3x + 4y = 2.050
3(1.350 - 3y) + 4y = 2.050
4.050 - 9y + 4y = 2.050
-5 y = 2.050 - 4.050
-5 y = -2.000
y = -2.000/-5
y = 400

x = 1.350 - 3(400)
x = 1.350 - 1.200
x = 150

10y + 5x
= 10(400) + 5(150)
= 4.000 + 750
= 4.750

semoga membantu ^_^

follow and jadikan yg terbrainly ya :) terima kasih