Question

x + 2Y = 4 3x + 5 Y = 9

Answer 1

A) x-y = 5

x = 5 + y

(5+y)*2 + 7y = 1

10 + 2y + 7y = 1

9y = 1-10

9y = -9

y = -1

x = 5 - 1

x = 4

B)x = 4 - 2y

3*(4-2y) + 5y = 9

12 - 6y + 5y = 9

-y = -3

y=3

x = 4 - 2*3

x = 4 - 6

x = - 2

C) 2x = 3 - 4y

2*(3 - 4y) - 8y = 2

6 - 8y - 8y = 2

-16y = -4

y = 4/16 = 1/4

2x = 3 - 4*1/4

2x = 3 - 1

2x = 2

x = 1