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olga_2 [115]
3 years ago
8

darryl spent $276 on books. math books cost $21 and English books cost $30. if he bought a total of 11 books how many of each ki

nd did he buy?
Mathematics
1 answer:
nata0808 [166]3 years ago
6 0
6 math books would be 126
5 English books would be 150
126+150=276 
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8x-5y=21 simultaneous linear equation<br>2x+9y=-5
olya-2409 [2.1K]

Answer:

x=2 and y=-1

Step-by-step explanation:

If two equations are given, we can solve one of the equation in terms of single variable and put it in the other equation which will further give the value of x and y.

For the given equations:

8x-5y=21              Equation:1

2x+9y=-5             Equation:2

Solving equation multiply equation 2 with 4 on both the sides

8x+36y=-20        Equation 3

Subtracting Equation:3 from Equation:1

8x-5y-(8x+36y)=21-(-20)\\8x-5y-8x-36y=21+20\\-41y=41\\y=-1

Putting value of 'y' in Equation:2 which will give the value of x

2x+9y=-5\\2x+9(-1)=-5\\2x-9=-5\\2x=4\\x=2

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3 years ago
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so n=2
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Answer:

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