Answer:
1) x=6, y=-6 which is (6,-6) as an ordered pair
3) x=10, y=-1 which is (10,-1) as an ordered pair
Step-by-step explanation:
Question 1:
<u>Solve them like an addition problem:</u>
-4x-2y=-12
4x+8y=-24
________
(-4x+4x)+(-2y+8y)=(-12+-24)
0x+6y=-36
6y=-36
y=-6
<u>Plug value of y into one of the original equations:</u>
4x+8(-6)=-24
4x-48=-24
4x=24
x=6
Question 3:
<u>Solve them like an addition problem:</u>
x-y=11
2x+y=19
_______
(x+2x)+(-y+y)=11+19
3x+0y=30
3x=30
x=10
<u>Plug value of x into one of the original equations:</u>
10-y=11
-y=1
y=-1
9514 1404 393
Answer:
11 years ago
Step-by-step explanation:
When Z is 3 times as old as M, the ratio of their ages is ...
M : Z = 1 : 3
The difference in their ages at that time is 3 - 1 = 2 "ratio units". The difference in their current ages is 50 -24 = 26 years, so 1 ratio unit = 26/2 = 13 years. Z was 3 times as old as M when M was 13 years old. (Z was 39.)
That was 24 -13 = 11 years ago.
_____
For most age problems, the difference between two ages is assumed to be a constant.
Answer:
, or 12.47
Step-by-step explanation:
I looked this up on my scientific calculator. I hope this helps! :)
Answer 1
She should put 7 students in each group. And there will be 4 groups.
Answer 2
She should put 4 students in each group and there will be 7 groups.
Explanation: 7*4 =28