Решите систему 7x+9y=15 8x-5y=4

Question

Решите систему
7x+9y=15
8x-5y=4

Answer 1

{7x+9y=15 //*5
{8x-5y=4  //*9

{35x+45y=75
+
{72x-45y=36

107x=111
x=111/107=1.03
5y=8*1.03-4
y=4.299/5=0.859

x=1.03
y=0.859