Question

1)rozwiaz uklad rownan

x+3y=5

2x-y=3 to jest uklad dwoch rownan

2)rozwiaz nierownosc

x²+6x-7≤0

Answer 1

X + 3 = 5 | -3

X = 2

 

2X - Y = 3 | - 2

X - Y = 1

 

 

Answer 2

x+3y=5

2x-y=3

 

x=5-3y

 

2(5-3y)-y=3

10-6y-y=3

-6y-y=3-10

-7y=-7/-7

y=1

 

x=5-3y

x=5-3*1

x=5-3

x=2