The equations 3x+ 4y = 10 -x+ 2y = 0 have the solution (a, b). The value of a + b is
3x + 4y = 0 ---> (1)
x - 2y = 10
$$(x - 2y = 10)\times2$$
2x - 4y = 20 ---> (2)
5x = 20
x = 4
y = -3
x + y = 1
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