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Mathematics
Booth
13 September, 19:07
7x - 2y = 4 5y + 3x = 10
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Peter Wilkerson
13 September, 20:20
0
7x-2y=4
3x+5y=10
so we can eliminate
eliminate y's
2 times 5=10
multiply first by 5 and 2nd by 2 and add
35x-10y=20
6x+10y=20 +
41x+0y=40
41x=40
divide both sides by 41
x=40/41
sub back
7x-2y=4
solve for y first to make it easier
-2y=4-7x
y = (7/2) x-2
y = (7/2) (40/41) - 2
y = (280/82) - 2
y=140/41-2
y=140/41-82/41
y=58/41
(x, y)
(40/41,58/41)
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