We go from 10x+20 = 50 to 10x = 30 after we subtract 20 from both sides. So we use the subtraction property (of equality).
Answer: Choice D
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A) x -y =1
B) x * y =1
B) y = 1/x
A) x -(1/x) = 1
Multiplying both sides by "x"
A) x^2 -1 = x
A) x^2 -x -1 = 0
Solving by the quadratic formula
x = 1.618 and
y = .618
Interestingly, the number 1.6180339... is called the "phi ratio" or the "golden ratio".
https://en.wikipedia.org/wiki/Golden_ratio
6x+12y-6z+7x7y-28z= 13x+19y-34z
Answer:
Let A equal the first number
Let B equal the second number
A=4b+6
B=b
4b+6+b=156
Step-by-step explanation:
Hope this helps :) Have a great day!!!!
