What is the value of the expression 6x - y when x = 3 and y = 1? (5 points)
1 answer:
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x = amount of the first alloy
y = amount of the second alloy
we know the first alloy is 25% copper, so then there is (25/100) * x of copper in it, namely 0.25x.
likewise, we know the second alloy is 75% copper so then there is (75/100) * y of copper or 0.75y.
he needs a 60 kgs mixture that 65% copper, or (65/100) * 60 = 39.
Answer:
Step-by-step explanation:
3(x - 4) = 11x
Expand the brackets:
3x - 12 = 11x
Subtract 3x from both sides to isolate the -12:
3x - 12 = 11x
3x - 3x - 12 = 11x - 3x
-12 = 8x
8x = -12
Divide both sides by 8:
Simplify fraction:
Hope this helps!