Question

x-y=1 and 3=y-2x by simultaneous equation solve graphically

Answer 1

Answer:

$x - y = 1....(1)$

$3 = y - 2x \\ 2x = y - 3 \\ 2x - y = - 3....(2)$

Subtracting equation (2) from equation (1)

$+ x \: \: \: - y = 1 \\ - 2x + y = 3 \\ - - - - - - - \\ - x + 0 = 4 \\ x = - 4$

Substituting value of x = -4 in equation (1)

$x - y = 1 \\ - 4 - y = 1 \\ - y = 1 + 4 \\ - y = 5 \\ y = 5$

( x, y ) = ( -4, 5 )