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Jane Neal
Mathematics
2 August, 00:52
4x+15y=13
3x+5y=16
solving systems by elimination
+4
Answers (
1
)
Samuel Lutz
2 August, 01:09
0
4x+15y=13 (1)
3x+5y=16 (2)
(2) * 3 - - > 9x+15y=48 becomes (3)
(3) - (1)
5x=35
x=7
sub x = 7 into (1)
4 (7) + 15y=13
28+15y=13
-28 - 28
15y = - 15
y = - 15/15
y = - 1
therefore x=7 and y = - 1
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