jessicaee1212 jessicaee1212

28-07-2020
Mathematics

contestada

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

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katie2031 katie2031

28-07-2020

Step-by-step explanation:

this is substitution method

Ver imagen katie2031

Answer Link

laura56718 laura56718

28-07-2020

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

Answer Link

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