Question

Resolva os sistemas.

a) x + y = 7
2
2y-x = 10

b) 3x+y = 12
x-5y = 4

c) 2x-3y = 11
x+5y = 16

d)2x-3y = 2
5x-7y = 6

e)x+3 (y+1) = -5
2x-y = 5
Pfvvv

Answer 1

2x- (5 - x)= 9

a) 2x-5 + x = 9 B)x + (-10 + 3x) = 18

x - 10 + 3x = 18

4x = 18 + 10

x = 28/4

x = 7

B)x + (-10 + 3x) = 18

3. 7 - y = 10

21- y = 10

-y = -11

y= 11

2x+ x = 14

3x= 14

x = 14/3