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sti192
23.09.2019 •
Mathematics
Elijah is selling coupon books for a school fund raiser. th coupon book sell for $11. the school gets $8 and $3 goes to elijah homeroom. if elijah sold 24 coupon book how much money did he collect? how much money went to his homeroom? how much money went to the school?
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Ответ:
24×$11=$264
Money that went to his homeroom is $72.
24×$3=$72
Money that went to the school is $192.
24×$8=$192
Ответ:
x= -1/2
y= 4.5
Step-by-step explanation:
4x+2y=7
3x-5y=-24
First either make the x or y's the same. It is easier here to make the y's the same.
Multiply each of the first equation by 5 and the second one by 2.
x5 4x+2=7 x5 = 20x+10y=35
x2 3x-5y=-24 x2= 6x-10y=-48
20x+10y=35
6x-10y=-48 +both equations
26x=-13
/26
x=-1/2
Now substitute to find y.
4(-1/2)+2y=7
-2+2y=7
+2
2y=9
/2
y= 4.5
Hope this helped :)