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16. Solve a) 3x + 2y = 6

5x- 2y = 26


b) 12x + 3y = 3

12x + y = 9​

1 Answer

2 votes

Hello!

A°)

3x + 2y = 6

3x = 6 - 2y

x = 2 - 2/3y

5x - 2y = 26

5(2 - 2/3y) - 2y = 26

10 - 10/3y - 2y = 26

-10/3y - 6/3y = 26 - 10

-16/3y = 16

-16y = 48

y = 48/-16

y = -3

3x + 2y = 6

3x + 2*(-3) = 6

3x - 6 = 6

3x = 12

x = 12/3

x = 4

B°)

12x + 3y = 3

4x + y = 1

y = 1 - 4x

12x + 3(1 - 4x) = 3

12x + 3 - 12 = 3

12x - 9 = 3

12x = 12

x = 12/12

x = 1

12*1 + 3y = 3

12 + 3y = 3

3y = 3 - 12

3y = -9

y = -9/3

y = -3

answered
User Scottrakes
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