Karl did because $58 for 20 pieces is cheaper than $63 for 21 and $3 for 21 pieces.
No solution because everything cancels out
Step-by-step explanation:
x×1/2×1/4×3/4
x×3/32
3/32x
Use elimination
Multiply first equation by 4
12a - 8b = 56
12a + 9b = 39
Subtract both
-17b = 17
b = -1
Plug in -1 for b
3a - 2(-1) = 14
3a = 12, a = 4
Final answer: a = 4, b = -1
