Question

2х+4*(20-х)=100      4х+2*(40-х)=100
помогите плизз

Answer 1

2х+4*(20-х)=100
2х + 80 - 4х = 100
-2х = 100 - 80
-2х = 20
х = 20 / -2
х = -10

4х+2*(40-х)=100
4х + 80 - 2х = 100
2х = 100 - 80
2х = 20
х = 20 / 2
х = 10

Answer 2

спс

Answer 3

пожалуйста)

Answer 4

2х+4*(20-х)=100
2х+80-4х=100
-2х=20
х= -10
_______________
4х+2*(40-х)=100
4х+80-2х=100
2х=20
х=10