Jawab:

Penjelasan dengan langkah-langkah:

a) SHORT STEPS USING SUBSTITUTION

Solve 3x+y+2z=5 for y.

y=−3x−2z+5

Substitute −3x−2z+5 for y in the second and third equation.

2x−3x−2z+5+4z=7

5x+2(−3x−2z+5)+z=9

Solve these equations for x and z respectively.

x=−2+2z

z= 1/3 - (1/3)x

Subtitution x to z

z = 3/5

find x

x = -4/5

subtitution x and z to y =−3x−2z+5.

y = 31/5

https://mathsolver.microsoft.com/en/solve-problem/@mo9lve5o

b) Consider the third equation. Divide both sides by 4.

z = 12/4 = 3

Consider the second equation. Insert the known values of variables into the equation.

y + 3(3) = 6

y = -3

Consider the first equation. Insert the known values of variables into the equation.

x−3+3=4

x = 4

https://mathsolver.microsoft.com/en/solve-problem/@18bctkhrp