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aev [14]
3 years ago
8

Marcin buys 7 rulers and 15 crayons for £7.

Mathematics
1 answer:
Rudiy273 years ago
7 0
Answer: 28 p



Explanation:

To solve this problem we're going to use an equation. First let's write down the information that we do know.Let's use (r) for ruler and (c) for crayon.
So 7 rulers and 15 crayons cost £7 (or 700 pennies) --> 7r + 15c = 700But we also know that r = c +12
So we can substitute c + 12 into the first equation where r is at the moment.
7(c+12) + 15c = 700
Now let's expand the brackets. We multiply 7 by c to get 7c and 7x12 t0 get 84
7c + 84 +15c = 70022c + 84 = 700 Here I'm going to take 84 away from both sides. 22c = 616
Remember this is a non calculator paper so we need to find an easy way of dividing 616 by 22.
616 divided by 22 is 28 so c = 28Each crayon therefore costs 28p
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Help, 3+7x=12, what is x?
liraira [26]
So just your normal equation. 
We need to isolate x alone. 
First lets write out our equation 
3 +7x = 12 

Lets do this step by step. 

first subtract 3 from both sides. 
3 + 7x = 12  
-3        = -3  it cancels out on the left side and we solve on the right side. 
*************
7x = 9 

second we divide both sides by 7 
7x = 9 
÷7 = 7      we got the x alone and we just write 9/7 as our answer. 

x = 9/7 

Or as a decimal. 
9/7 could be <span>1.28571428571429
</span>
Either will work. 
x = 9/7 
or 
x = <span>1.28571428571429
</span>
Have a nice day. :)



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4 years ago
PLEASE ANSWER 60 POINTS!!!!! and brainlyist
Pepsi [2]

Answer:

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Step-by-step explanation:

4 0
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10(1 – 2y) = -5(2Y - 1)
mars1129 [50]

Answer:

y =1/2

Step-by-step explanation:

solve for ; y

10(1 – 2y) = -5(2Y - 1)

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