Answer:
Approximately 6.78
Explanation:
–3x + 10y = –7 - - - - - - > (1)
–3x + 4y = –19 - - - - - - > (2)
(1) - (2) Because if same sign then you have subtract to cancel out the equal numbers therefore - 3x and - 3x is cancelled out
6y = +2
y = 2 ÷ 6
y = 1/3
Then to find the value of x substitute value of y
-3x + (4 × 1/3) = - 19
-3x + 4/3 = - 19
- 3x = - 19 - 4/3
- 3x = - 61/3
x = ( - 61/3 ÷ -3)
x = 6.78