Question

Descubra os valores das invógnitad abaixo
4x+y=2
6x-3y=3

2x+y=30
5x-y=40​

Answer 1

4x + y = 2

6x - 2y = 3

y = 2 - 4x

6x - 2y = 3

6x - 2(2 - 4x) = 3

6x -4 + 8x = 3

14x = 3 + 4

14x = 7

x = 7/14

x = 1/2

y = 2 - 4x

y = 2 - 4(1/2)

y = 2 - 2

y = 0

(1/2, 0)

2x + y = 30

5x - y = 40

y = 30 - 2x

5x - y = 40

5x - (30 - 2x) = 40

5x - 30 + 2x = 40

7x = 40 + 30

7x = 70

x = 70/7

x = 10

y = 30 - 2x

y = 30 - 2(10)

y = 30 - 20

y = 10

(10, 10)