Answer:
x = -6
Explanation:
you have given
10x + 8y = 12 and 4x + y = -15
so you must put the one var. x or y by same cofficent and in opposite sighn
so 10x + 8y = 12
- 8 (4x + y = -15 ) ......... i multiplied by -8
10x + 8y = 12
-32x - 8y = 120
then you will add the equation
(10x + 8y) + (-32x - 8y) = 12 + 120
afeter you simlify it u will get
-22x = 132
-22x = 132
x = -6 .... by dividing both sides by -22