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dsp73
3 years ago
8

Solve the system of equations using the substitution method (pic) x=y=​

Mathematics
2 answers:
Flura [38]3 years ago
8 0

Answer:

(-2,3)

Step-by-step explanation:

kondor19780726 [428]3 years ago
6 0

Answer: x= -2 and y= 3

Step-by-step explanation:

The given system of linear equations :

4x+5y=7--------------(1)\\\\ y=3x+9-----------------(2)

By using Substitution method , we substitute the value of y from (2) in (1) , we get

4x+5(3x+9)=7

\Rightarrow\ 4x+15x+45=7

\Rightarrow\ 19x=7-45

\Rightarrow\ 19x=-38

\Rightarrow\ x=-2  [Divide both sides by 2]

Now , put the value of x in (2) , we get

y=3(-2)+9=-6+9=3

∴  x= -2 and y= 3 .

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1.
An expression of the form a \frac{b}{c} is called a "compound fraction"
 
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when we subtract or add a fraction \frac{m}{n} from an integer k, 

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3.

Thus, 

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4.

The simple fraction 7/2 is not an option, so we write it as a compound fraction as follows:

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5. Answer: D
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