keeykeey22 keeykeey22

03-03-2017
Mathematics

contestada

use the elimination method to solve the system of equations. choose the correct ordered pairs 7x+3y=30 and -2+3y=3

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texaschic101 texaschic101

03-03-2017

7x + 3y = 30
-2x + 3y = 3....multiply by -1
-----------------
7x + 3y = 30
2x- 3y = -3 (result of multiplying by -1)
----------------add
9x = 27
x = 27/9
x = 3

7x + 3y = 30
7(3) + 3y = 30
21 + 3y = 30
3y = 30 - 21
3y = 9
y = 9/3
y = 3

solution is (3,3)

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