Hey there!
The answer is 
We will start by forming an equation to solve this.
So we are starting with a number, 
, then doubling it and adding 
, which gives us 25.
So:
Now we solve this equation:
Have a super awesome day!
Answer:
x=1/2k
Solution:
4kx+10kx= 7
14kx=7
Divide 14k from both sides.
x=7/14k
x=0.5k
Answer: (0, 5) and (-2, 0)
<u>Step-by-step explanation:</u>
10x - 4y = -20
Let x = 0, then 10(0) - 4y = -20
-4y = -20
<u> ÷ -4 </u> <u>÷ -4 </u>
y = 5
Let y = 0, then 10x - 4(0) = -20
10x - 0 = -20
<u> ÷10 </u> <u> ÷10 </u>
x = -2
Answer: 2((x+y)-21)
Calculation/Explanation:
Twice the sum of x and y decreased by 21 means that you must add x and y first before decreasing by 21. The last step is to double the whole equation that we just performed.
