a+b=350 => a=350 - b
3a + 5b = 1450
3(350-b)+b=1450
1050-3b+5b=1450
2b=400
b=200
a=150
Answer:
10.7
Step-by-step explanation:
You set up the proportion like this:

When you solve for x you get

x=10.7 rounded to the nearest tenth
The answer is -.0028571429
1/5a+1=3/10
-1 -1
1/5a=-.7. -.7 as a fraction is -7/10
1/5a divide -7/10
= -.0028571429
Answer: The answer would be D.
Step-by-step explanation: I put down the points then simply reflected it over the y-axis. I did this by using the the opposite of the x number and the same y number. Hope this helps!