Answer:
Mary is 10 years old, and her father is 40 years old.
Step-by-step explanation:
Let Mary's age = x.
Mary's father is four times as old, so he is 4x.
Five years ago, Mary was x - 5, and her father was 7(x - 5).
Five years ago, Mary's father was 4x - 5.
7(x - 5) = 4x - 5
7x - 35 = 4x - 5
3x = 30
x = 10
4x = 4 * 10 = 40
Mary is 10 years old, and her father is 40 years old.
Answer:
1 banana= $0.80
1 apple
Step-by-step explanation:
Simultaneous equations
3b+4a=23
4b+2a= 14 x2
1. Make one of the b or a the same
8b+4a=28
3b+4a=23
2. Different add same subtract
5b=4
1 banana =$ 0.80
3. Substitute+solve
3.20+4a=14
4a=14-3.21
4a=10.8
a=2.70
Answer:
Yes
Step-by-step explanation:
Hope this helps!
Good Luck!
Answer:
the answer to the value of X is 0-3
Answer:
please see photo for detailed analysis.