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eimsori [14]
3 years ago
10

Step problems please

Mathematics
2 answers:
olganol [36]3 years ago
8 0

7. $14

8. 5.8 hours

9. 60

10. 24 books

notka56 [123]3 years ago
7 0

Answer:

Step-by-step explanation:

7. Let the price of book be x

:- 8x + 17 = 129

8x = 129 - 17

8x = 112

x = 112/8

x = $14

Each book cost $14

8. Let the number of hours be x

9x + 15 = 87

9x = 87 - 15

9x = 72

x = 72/9

x = 8hrs

He paid for 8hours

9. Let the numbers be x, x +2, x +4,

So. x + x + 2 + x + 4 = 168

3x + 6 = 168

3x = 168 - 6

3x = 162

x = 162/3

x = 54

The smallest number is 54

10. Let the number of books be x

So, x/2 + 6 = 18

x/2 = 18 - 6

x/2 = 12

x = 12 ×2

x = 24

So she has 24 book's before

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3 years ago
Math help @LIEMONDER
klio [65]
First picture)
I: 5x+2y=-4
II: -3x+2y=12

add I+(-1*II):
5x+2y-(-3x+2y)=-4-12
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5*(-2)+2y=-4
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question 6)
I: totalcost=115=3*childs+5*adults
II: 33=adults+childs
33-adults=childs

insert childs into I:
115=3*(33-adults)+5*adults
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so it's the last option

question 7)
a) y<6 and y>2 can also be written as 2<y<6, so solution 3 exist for example
b) y>6 and y>2 can also be written as 2<6<y, so solution 7 exist for example
c) y<6 and y<2 inverse of b: y<2<6, so for example 1
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so it's the last option

question 8)
I: x+y=12
II: x-y=6

subtract: I-II:
x+y-(x-y)=12-6
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insert y into I:
x+3=12
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(9,3)

question 9)
I: x+y=6
II: x=y+5

if you take the x=y+5 definition of II and substitute it into I:
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