find a + b , if 3a + 2b = 13 and 4a - 2b = 8.
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Answered by
23
4a - 2b = 8
2b = 4a - 8
3a + 2b = 13
3a + (4a - 8) = 13
3a + 4a = 13 + 8
7a = 21
a = 3
2b = 4a - 8
2b = 12 - 8
2b = 4
b = 2
a + b
= 3 + 2
= 5
2b = 4a - 8
3a + 2b = 13
3a + (4a - 8) = 13
3a + 4a = 13 + 8
7a = 21
a = 3
2b = 4a - 8
2b = 12 - 8
2b = 4
b = 2
a + b
= 3 + 2
= 5
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Answered by
5
3a+2b=13_(1)
4a-2b=8_(2)
adding (1) &(2)
7a=21
a=21/7
a=3
put a in (1)
3×3+2b=13
2b=13-9
b=4/2
b=2
a+b=3+2
a+b=5
4a-2b=8_(2)
adding (1) &(2)
7a=21
a=21/7
a=3
put a in (1)
3×3+2b=13
2b=13-9
b=4/2
b=2
a+b=3+2
a+b=5
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