1) {x-y=5

{x^2+5x=0

2) {x^2+y^2=26

{x-y=-4

3) {x+y=7

{y^2-3y=0

напишите только решение без слов

1) {x - y = 5, x^2 + 5x = 0}

x (x + 5) = 0

x = 0, y = - 5

x = - 5, y = - 10

2) {x^2 + y^2 = 26, x - y = - 4}

y = x + 4

x^2 + (x+4) ^2 = 26

2x^2 + 8x + 16 = 26

x^2 + 4x - 5 = 0

x = - 5, y = - 1

x = 1, y = 5

3) {x+y = 7, y^2 - 3y = 0}

y (y-3) = 0

y = 0, x = 7

y = 3, x = 4