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4 years ago

5

Simultaneous equations 2x + y = 21 x - y = 6

2 answers:

kirill115 [55]4 years ago

6 0

Answer:

2x + y = 21

+

x - y = 6

_________

3x = 27

x = 27 ÷ 3

x= 9

x - y = 6

9 - y = 6

9 - 6 = y

3 = y

Therefore, x= 9 and y = 3

Varvara68 [4.7K]4 years ago

3 0

Step-by-step explanation:

this is substitution method

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