If △ABC≅△VXW then:
AB = VX
CB = WX
Evaluating:
Solving the first equation for y:
y + z = 40
y = -z + 40
Substituying y = -z + 40 in the second equation:
29z - 2z = 544 - 4
27z = 540
z = 540 / 27
z = 20
y = -20 + 40
y = 20
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