If 4x - 5y = -37 and 7x + y = -16, then x - y =
Equation 1Â : $$4x - 5y = -37$$
Equation 2Â : $$7x + y = -16$$
Multiplying equation (2) by 5, we get : $$35x + 5y = -80$$
Adding above equation to equation (1)
=> $$(4x + 35x) + (-5y + 5y) = -37 - 80$$
=> $$39x = -117$$
=> $$x = \frac{-117}{39} = -3$$
Substituting value of $$x$$ in equation (2)
=> $$y = -16 - 7(-3) = 21 - 16 = 5$$
$$\therefore$$ $$(x - y) = -3 - 5 = -8$$
=> Ans - (A)
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