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If the question is
x + 4z - 5 - 3x when x = 2 and z = 3x, then
First simplify the original statement
x + 4z - 5 - 3x = 4z - 5 - 2x
Secondly substitute in 3x for z
4z - 5 - 2x = 4*3x - 5 - 2x
= 12x - 5 - 2x
= 10x - 5
Lastly substitute 2 for the x
10x - 5 = 10*2 - 5
= 20 - 5
= 15
or
x + 4z - 5 - 3x when x = 2 and z = 3x, so z = 3*2 = 6
x + 4z - 5 - 3x
= 4z - 5 - 2x (replace the variables with the corresponding values)
= 4*6 - 5 - 2*2
= 24 - 5 - 4
= 24 - 9
= 15
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∙ 13y ago
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