3x+2y-z+5w=20
y=2z-3w
z=w+1
2w=8
Solve this system.
2 answers:
Step-by-step explanation:
or , w = 8/2
or , w = 4
i think this is the answer
Start from the last equation:
2w = 8 ⇒ w = 4
z = w + 1 ⇒ z = 4 + 1 ⇒ z = 5
y = 2z - 3w ⇒ y = 2•5 - 3•4 ⇒ y = -2
3x + 2y - z + 5w = 20 ⇒ 3x + 2•(-2) - 5 + 5•4 = 20
⇒ 3x = 9 ⇒ x = 3
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