Charlotte O.
asked • 10/23/182-3(x+6z)=4(z+1)+18
The answer the answer sheet is -13/11 but I can't solve to that.
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1 Expert Answer
Andy C. answered • 10/24/18
Tutor
4.9
(27)
Math/Physics Tutor
You have 2 unknowns but only 1 equation
2 - 3x - 18z = 4z+ 4 + 18
2 - 3x - 18z = 4z + 22
-3x - 18z = 4z + 20
-3(x+6z) = 4(z+5)
x + 6z = (-4/3)(z+5)
x = (-4/3)z + (-4/3)(5) - 6z
= (-4/3)z - (20/3) - 6z
= (-4/3)z - 20/3 - (18/3)z
= (-22/3)z - 20/3
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Arturo O.
You have two variables, x and z, but only one equation. It takes two equations to solve for two variables.10/23/18