Answer:
10 pairs of socks for $11.99
Step-by-step explanation:
6.99/6 = 1.165
1.99/10 = 0.199
0.199 < 1.165
-3x+7y=5 (x2) -> -6x+14y=10
-6x+14y=10
-8x+14y=-10
——————— -
2x=20
x=20/20
x=1
Susbstitute x=1,
-8x+14y=-10
-8(1)+14y=-10
-8+14y=-10
14y=-10+8
14y=-2
y=-2/14
y=-1/7
I hope it helps
