First we want to isolate x from 5x + y = 9 so to do so. We subtract y from both sides.
5x + y - y = 9 - y
Simplify.
5x = 9 - y
Divide both sides by 5.
5x/5 = 9/5 - y/5
Simplify again.
x = 9 - 5/y
Substitute x = 9 - 5/y
So 10 * 9 - 5/y - 7y = -18.
We wanna isolate y so...
10 * 9 - 5/y
Multiply the fractions.
(9 - y) * 10/5
Divide the numbers (10/5 = 2)
2(-y + 9)
Now we want to expand this.
2 * 9 + 2(-y)
Apply the minusplus rule
2 * 9 - 2y
This gives us 18 - 2y
From there we can add the similar elements
-2y - -7y = -9y
18 - 9y = -18
Subtract 18 from both sides.
18 - 9y - 18 = -18 - 18
Simplify again.
-9y = -36
Now divide both sides by -9
-9y/-9 = -36/-9
This gives us y = 4.
For x we just want to substitute 4 into it.
So 9 - 4/5 which is 5/5 which translates to 1.
Therefore y = 4 and x = 1.
Answer:
your family
Step-by-step explanation:
1,900/2 = 950
2,700/3 = 900
your family travels 950 miles every day whereas their family travels 900 miles every day :)
Answer:
it's an acute angle.
less than 90 degrees
Step-by-step explanation:
the right angle ( abd) is 90 degrees.
you have another number which is 75 degrees
subtract 90 degrees - 75 degrees and you answer is 15
Answer:
Lets see
Step-by-step explanation:
For 1 there is the boy girl boy girl pattern,2 Two girls two boys pattern,3 girls first boys last,4 boys first girls last. There are about 4-6 ways the members can be arranged.
Answer: $8000
Step-by-step explanation:
Let the minimum amount that she needs to sell in order to earn $600 be x.
Therefore, 7.5% of x = $600
7.5% × x = $600
0.075 × x = $600
0.075x = $600
x = $600 / 0.075
x = $8000
The minimum amount she needs to sell will be $8000.