Answer:
163
Step-by-step explanation:
10(10)+9(7) <em>Stubstitute the variables for the values given</em>
100+63 <em>Multiply </em>
163 <em>Add</em>
Solve for y means isolate y.
7x + 4y = 8
4y = -7x +8
y = -7/4x + 2
For this question you would divide $8.52 by 36 pencils to get about $0.24 per pencil for brand A rounded to the nearest cent. Then divide $9.98 by 48 pencils to get about $0.21 per pencil for brand B rounded to the nearest cent.
First set up your two equations:
x + y = 90
x = 2y - 30
Then substitute what x equals in the second equation into the first equation:
(2y -30) + y = 90
Now solve for y:
3y -30 = 90
3y = 120
y = 40
Then use y = 40 and substitute the value for y into one of your original equations and solve for x. I'll choose the first one, but either one will work.
x+ 40 = 90
x = 50
So your solution is x = 50 and y = 40
Answer:
1. 4
2. 16
3. 4/3
4. 64/3
Step-by-step explanation: