Question

7x + 11y= -2
7x + 3y= 30

Answer 1

X = - 2/7 - 11y/7
X = 30/7 - 3y/7

Answer 2

y = -4

x = 6

Solution:

7x + 11y = -2 [1]

7x + 3y = 30 [2]

[1] - [2],

8y = -32

y = -4

(use substitution method to find x)

substitute y = -4 into [2],

7x + 3y = 30

7x + 3(-4) = 30

7x - 12 = 30

7x = 30 +12

7x = 42

x = 6