Solve the system by substitution.
-4x-y=1
-9x+9=y

Add  

9

to both sides of the equation.

x

=

y

+

9

x

+

y

=

6

Replace all occurrences of  

x

with  

y

+

9

in each equation.

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2

y

+

9

=

6

x

=

y

+

9

Solve for  

y

in the first equation.

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y

=

−

3

2

x

=

y

+

9

Replace all occurrences of  

y

with  

−

3

2

in each equation.

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x

=

15

2

y

=

−

3

2

The solution to the system is the complete set of ordered pairs that are valid solutions.

(

15

2

,

−

3

2

)

The result can be shown in multiple forms.

Point Form:

(

15

2

,

−

3

2

)

Equation Form:

x

=

15

2

,

y

=

−

3

2

image of graph

Step-by-step explanation:

the answer would be 150 books

step-by-step explanation:

if you divide 300 by 2 you will get 150

answer: 270

step-by-step explanation:

you have to times 200 by 1.35 to get your answer