lindsayeve22 lindsayeve22

17-10-2021
Mathematics

contestada

Solve the simultaneous equations

3x + 2y = 30
3x - y = 21

Solve the simultaneous equations 3x 2y 30 3x y 21 class=

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minumanshoo minumanshoo

17-10-2021

Answer:

x = 8 , y = 3

Step-by-step explanation:

3x + 2y = 30

3x - y = 21 -> y = 3x - 21

3x + 2 (3x - 21) = 30

3x + 6x - 42 = 30

3x + 6x = 30 + 42

9x = 72

x = 72/9 = 8

y = 3*8 - 21 = 24 - 21 = 3

∴ x = 8 & y = 3

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