Question

solve it by substitution method
11x+15y+23=0
7x-2y-20=0

Answer 1

Ist equation
11x+15y+23=0
11x+15y= -23
15y= -23-11x
y= -23-11x/15----------(1)


IInd equation
7x-2y-20=0
7x-2*-23-11x/15-20=0. (By 1)
7x-2*23/15-11x/15-20=0
7x-11x/15=46/15+20



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Answer 2

11x + 15y + 23 = 0 ---------------------(1)

7x - 2y - 20 = 0  -------------------(2)

2y = 7x - 20

y = 7x/2 - 10        put in equation (1)

11x + 105x/2 -150 + 23 = 0

127x/2 - 127 = 0

x = 2    put in equation (2)

14 - 2y - 20 = 0

y = -3