Step-by-Step Solution. (Including an attached plot.)

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xxx us xxxxxxxxx x xxxxxx

-7 x x x x = 6
xx x - y = - 19 multiply xxxx xxxxxxxx with xxxx
xxxxxxxxxxxxxxxxxx
-7 x x 4 y = x
x x + y x xx add both xxxxxxxxx
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x x x 5 x = 25 xxxxxx both sides xx xxx equation by x
y x 25/5 x 5

xxxx for x we xxxx xx e.g. xxx xxxxxx xxxxxxxx and solve it for xx

xx x x x x - 19 add y xx both xxxxx xx the equation
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-7 x = - 19 x y xxxxxx both sides xx xxx equation xx -7
x = (- 19 x y)/(-7) x xxx x xxxx

xxxxxxxx y=5:
x x (19 - xxxx = (19 - 5)/7 = xxxx = 2

xxxxxxxxx xxxx solution is:

x x xx x = xx

xxxx at xxx diagram attached. At x = 2 xxx x x x xxxx lines xxxxxxxxxx

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