Answer:
7
Step-by-step explanation:
x-7=7-x
2x-7=7
2x=14
x=7
So i just finished this lesson. I am taking Algebra 1.
All you need to do is determine which number is X, and which number is Y. The formula is Y2-Y1 over X2-X1. Here is an example. And then make sure you simplify it to simplest form.
Answer:
I think the answer is 11i
Let x is Casey's sister age.
<span>3 years ago:
</span><span>Casey was twice as old as his sister: 2a - 3
Now:
</span><span>he is 5 years older than his sister: a + 5
2a - 3 = a + 5
subtract a to both sides
2a - 3 -a = a + 5 - a
simplify
a - 3 = 5
add 3 to both sides
a - 3 + 3 = 5 + 3
simplify
a = 8
His sister age is 8 years old now.
</span>Now:
he is 5 years older than his sister: a + 5 = 8 + 5 = 13
<span>
proof:
so 3 years ago,
his sister age: 8 - 3 = 5
Casey age 3 years ago:
13 - 3 = 10 (</span>C<span>asey was twice as old as his sister 3 years ago</span>)
<span>
Answer:
Casey is 13 years old now.
</span>
Answer:
answered
Step-by-step explanation: