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5a + 7b = 4b - 2
5b + 3 = 5b + 3a
5a + 7b - 4b = - 2
- 3a + 5b - 5b = - 3
5a + 3b = - 2
- 3a = - 3 stąd a = - 3/- 3 = 1
5a + 3b = - 2
5 + 3b = - 2
3b = - 2 - 5 = - 7
b = - 7/3 = - 2 1/3
odp
a = 1
b = - 2 1/3
trójkąt równoboczny
5y + 5 = x + 3y
x + 3y = 2x
- x + 5y - 3y = - 5
x - 2x + 3y = 0
- x + 2y = - 5
- x + 3y = 0 stą - x = - 3y
- 3y + 2y = - 5
- y = - 5
y = 5
- x = - 3 * 5 = - 15
x = 15
odp
x = 15
y = 5
trapez
(c + d) - 15 = 2d
2c - 3d = c - 5
c + d - 15 = 2d
2c - c - 3d = - 5
c + d - 2d = 15
c - 3d = - 5
c - d = 15
c - 3d = - 5
odejmujemy równania
c - c - d + 3d = 15 + 5
2d = 20
d = 20/2 = 10
c - d = 15
c - 10 = 15
c = 15 + 10 = 25
odp
c = 25
d = 10