Question

using elimination method solve the following x+y-40=0, 7x+3y=180​

Answer 1

Answer:

$x + y - 40 = 0 \\ = > 3x + 3y - 120 = 0$

$on \: subtracting \: eq(2) \: from \: eq(1) \\ \\ 4x - 60 = 0 \\ 4x = 60 \\ x = 15 \\ \\ x + y = 40 \\ y = 40 - 15 \\ y = 25$

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