Question

{0,2x+15y=9,8. { 0,3x-0,5=0
{0,75-10y=-3. { 0,1x+2y=6,5

Answer 1

{0.2х+15у=9.8
{0.75-10у=-3
-10у=-3-0.75
-10у=-3.75|:(-10)
у=0.375
0.2х+15у=9.8
0.2х+15×0.375=9.8
0.2х=9.8-5.625
0.2х=4.175|:0.2
х=20.875

{0.3х-0.5=0
{0.1х+2у=6.5
0.3х=0.5|:0.3
х=1.67
0.1х+2у=6.5
2у=6.5-0.1×1.67
2у=6.5-0.167
2у=6.333|:2
у=3.1665