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16.04.2020 •
Mathematics
Mr. Steve got a $12 discount on a $60 head set. What was the percentage discount Mr. Steve got?
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Ответ:
20%
Step-by-step explanation
Do 60/12 to find the number of times 12 can go into 60. That would equal 5. Then divide 100/5 to find the percentage
Ответ:
x=-2
y=-3
Step-by-step explanation:
-9x+4y = 6
9x+5y = -33
We will add these together to eliminate x
-9x+4y = 6
9x+5y = -33
0x +9y =- 27
9y = -27
Divide by 9
9y/9 = -27/9
y =-3
We still need to find x
9x +5y = -33
9x +5(-3) = -33
9x-15 = -33
Add 15 from each side
9x+15-15 =-33+15
9x=-18
Divide by 9
9x/9 = -18/9
x = -2