Question

A) X + 7Y = -2
-X - 4Y = -1

Answer 1

X=-2-7y

-(-2-7y)-4y=-1

...........

2+7y-4y=-1

...........

2+3y=-1

..........

3y=-1-2

.........

3y=-3

X=-2-7y

y=-3/3

X=-2-7y

y=-1

X=-2-7(-1)

y=-1

x=-2+7

y=-1

x=5