Jake spent a total of 70 cents.
b = black-and-white = 8 cents
c = color = 15 cents
70 = 8b + 15c
he made a total of 7 copies
b + c = 7
system of equation:
70 = 8b + 15c
b + c = 7
--------------------------
b + c = 7
b + c (-c) = 7 (-c)
b = 7 - c
plug in 7 - c for b
70 = 8(7 - c) + 15c
Distribute the 8 to both 7 and - c (distributive property)
70 = 56 - 8c + 15c
Simplify like terms
70 = 56 - 8c + 15c
70 = 56 + 7c
Isolate the c, do the opposite of PEMDAS: Subtract 56 from both sides
70 (-56) = 56 (-56) + 7c
14 = 7c
divide 7 from both sides to isolate the c
14 = 7c
14/7 = 7c/7
c = 14/7
c = 2
c = 2
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Now that you know what c equals (c = 2), plug in 2 for c in one of the equations.
b + c = 7
c = 2
<em>b + (2) = 7
</em><em />Find b by isolating it. subtract 2 from both sides
b + 2 = 7
b + 2 (-2) = 7 (-2)
b = 7 - 2
b = 5
Jake made 5 black-and-white copies, and 2 color copies
hope this helps
I'm not quite sure what you are asking here,
but I got x = 11.
Answer:
10/11
Step-by-step explanation:
At first we have to swap the fractions to make those fractions into a normal number. Because it will become a multiplication.
4 × (x + 5) < 5 × (3x + 2)
We will multiply the numbers by the brackets.
4x + 20 < 15x + 10
Now we swap the constant and values from left to right side.
4x - 15x < 10 - 20
or, - 11x < -10
If we divide the inequality by a negative number, say - 11, the inequality becomes reverse.
Therefore,
[-11x ÷ (-11)] > [(-10) ÷ (-11)]
or, x > (10/11)
Answer:
15cm
Step-by-step explanation:
because length is given as 8 cm and perimeter is length+width+length+width
so if you take 8cmX2 since its taken twice to get the perimeter and 15cmX2 you get 46cm which originally the question said was the peemiter
Answer:
x + 1/4 = 2/3
Step-by-step explanation:
one-fourth more than a number
x + 1/4
