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Please please help me with this

Please please help me with this-example-1
User Milky
by
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2 Answers

2 votes

Answer: ( -9, 1, 4 )

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Explanation

This system is in row echelon form. We can use back-substitution to start with the value of z to use it to find the value of y, then use y & z values to find the value of x.

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Plug z = 4 into the equation with y & z in it. Solve for y

-3y + 2z = 5

-3y + 2*4 = 5

-3y + 8 = 5

-3y + 8 - 8 = 5 - 8

-3y = -3

-3y/(-3) = -3/(-3)

y = 1

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Now plug y = 1 and z = 4 into the first equation. Solve for x.

x + y - 3z = -20

x + 1 - 3*4 = -20

x + 1 - 12 = -20

x - 11 = -20

x - 11+11 = -20+11

x = -9

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We get x = -9, y = 1, z = 4.

Therefore, the solution is (x,y,z) = (-9, 1, 4)

User Eugene Tolmachev
by
8.5k points
6 votes

Answer:x = -9

y = 1

z = 4

Explanation:

Please please help me with this-example-1
Please please help me with this-example-2
User Mpalanco
by
7.9k points

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