Asked by Happy
elimination mtd,5a-2b=14,2a+2b=14
Answers
Answered by
Bosnian
5 a - 2 b = 14
+
2 a + 2 b = 14
___________
7 a = 28
a = 28 / 7
a = 4
Replace a by 4 in first equation:
5 a - 2 b = 14
5 ∙ 4 - 2 b = 14
20 - 2 b = 14
Subtract 20 to both sides.
- 2 b = - 6
b = - 6 / - 2
b = 3
OR
Replace a by 4 in second equation:
2 a + 2 b = 14
2 ∙ 4 + 2 b = 14
8 + 2 b = 14
Subtract 8 to both sides.
2 b = 6
b = 6 / 2
b = 3
The solution is:
a = 4 , b = 3
+
2 a + 2 b = 14
___________
7 a = 28
a = 28 / 7
a = 4
Replace a by 4 in first equation:
5 a - 2 b = 14
5 ∙ 4 - 2 b = 14
20 - 2 b = 14
Subtract 20 to both sides.
- 2 b = - 6
b = - 6 / - 2
b = 3
OR
Replace a by 4 in second equation:
2 a + 2 b = 14
2 ∙ 4 + 2 b = 14
8 + 2 b = 14
Subtract 8 to both sides.
2 b = 6
b = 6 / 2
b = 3
The solution is:
a = 4 , b = 3
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