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iragen [17]
3 years ago
10

If 2a-8=4 and 3b-8=10, what is the value of a+b?

Mathematics
2 answers:
Zarrin [17]3 years ago
5 0
I would solve both the equations 1st before I do anything else. Then if it says add a+b then add the two solutions you have.
Irina-Kira [14]3 years ago
3 0
A=6
2*6=12
12-8=4
B=6
3*6=18
18-8=10

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If the ratio of y to x is equal to 3 and the sum of y and x is 80, what is value of y
Rus_ich [418]

Answer:

y = 60

Step-by-step explanation:

<h3>Step 1: Make sense of the given</h3>

"The ratio of y to x is 3"

This means that, y\div x=3

"The sum of y and x is 80"

This means,  x+y=80

<h3>Step 2: Make use of the facts</h3>

If y\div x=3, then y = (3*x).

We can plug this into the other equation by substitution:

x + (3 * x)=80

This simplifies to:

4x = 80

Which we can solve out and get:
x=20.

<h3>Step 3: Plug and Chug</h3>

We solved for x, but we need the value of y.

So, we go back to the equation we first derived: "y = (3*x)".

And now we substitute the value of x, into this.

y = (3 * (20))

By solving this out, we get:
y=60

So, the value of y is 60.

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2 years ago
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