Answer:
84
Step-by-step explanation:
12*3+6x=4.20(12+x)
36+6x=50.4+4.2x
6x-4.2x=50.4-36
1.8x=14.4
x=14.4/1.8
x=8 pounds of cashews is used.
Proof:
12*3+6*8=4.2(12+8)
36+48=4.2*20
84=84
(not mine)
from algebra.com
Answer:
3x+8y=-5-equatin.1
-2x+2y=18-equation.2
now,
subtracting both equation.1 by equation.2,then
3x+8y=-5
-8x+8y=72
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