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Mathematics
Tiana Randolph
21 March, 16:07
2x + y = 20
6x - 5y = 12
+2
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Kira Garrett
21 March, 16:53
0
5 (2x + y = 20) = (10x + 5y = 100)
(10x + 5y = 100) + (6x - 5y = 12) = 16x = 112
112/16 = 7
The final answer is 7.
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Savannah Walter
21 March, 17:36
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Rearrange the first equation
2x + y = 20
take away 2x from both sides
y = 20 - 2x
substitute this y value into the second equation
6x - 5 (20 - 2x) = 12
6x - 100 + 10x = 12
add 100 to both sides
6x + 10x = 112
16x = 112
divide both sides by 16
x = 7
Substitute this x value into the first equation to get y.
2 (7) + y = 20
14 + y = 20
take away 14 from both sides
y = 6
So, y = 6 and x = 7
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