Question

A) X+Y=12 B) X=2Y C) X+Y=5
X-Y=2 X+Y=12 X+3Y=11

Answer 1

Resposta:

a) X = 12-Y

12-Y-Y = 2

12-2Y = 2

-2y = 2-12

-2y = -10

2y = 10

y = 10 ÷ 2

y = 5

X + 5 = 12

X = 12-5

X = 7

b) X = 2Y

2Y+Y = 12

3Y = 12

Y = 12 ÷ 3

Y = 4

X = 2.4

X = 8

c) X = 5-Y

5-Y+3Y = 11

5+2Y = 11

2Y = 11-5

2Y = 6

Y = 6 ÷ 3

Y = 2

X + 2 = 5

X = 5-2

X = 3