Question

Me ajudem!!!
A){y=3x
{x+4y=26

B){x/2+y=7
{2y-x=10

Answer 1

A)
{y=:3x
{x+4y=26

x + 4y = 26
x + 4.3x = 26
x + 12x = 26
13x = 26
x = 26/13
x = 2

y = 3x
y = 3.2
y = 6

R: x = 2; y = 6

B)
{x/2+y=7
{2y-x=10

x/2 + y = 7
(x + 2y)/2 = 2.7/2
x + 2y = 14
x = 14 - 2y

2y - x = 10
- x + 2y = 10
- (14 - 2y) + 2y = 10
- 14 + 2y + 2y = 10
4y - 14 = 10
4y = 10 + 14
4y = 24
y = 24/4
y = 6

x = 14 - 2y
x = 14 - 2.6
x = 14 - 12
x = 2

R.: x = 2; y = 6