All categories

3 years ago

Help help help please using the elimination solve this

Mathematics

1 answer:

serious [3.7K]3 years ago

3 0

Answer:

a = 15

b = -14

Step-by-step explanation:

Here, we want to solve by elimination

let us start by rewriting the first equation

We can do this by multiplying through by 10

We have this as;

2a -5b = 100

Now let us eliminate

Multiply equation ii by 2 and equation i by 1

2a -5b = 100

2a-2b = 58

Subtract equation ii from i

-3b = 42

b = 42/-3 = -14

Secondly;

Multiply equation ii by 5 and i by 1

2a - 5b = 100

5a -5b = 145

Subtract ii from i

-3a = -45

a = 45/3

a = 15

You might be interested in

Write 2.161616 as a mixed number

balandron [24]

I believe it's 2 16/99

4 0

3 years ago

Question on the picture:

Nimfa-mama [501]

Answer:

$36\ feet$

Step-by-step explanation:

Assume that the shadow of an object in this problem is proportional to the height of the object. One can form the following ratio to describe the objects in this problem,

$(height):(shadow)$

As per the given problem, a (6) foot person casts a (1.7) foot shadow. Therefore, one can form the following ratio,

$6:1.7$

It is given that there is a lighthouse that has a shadow of (10.2) feet, one is asked to find its height. Use the parameter (x) to represent the unknown; since the ratios are related, one can form a proportion to solve for(x).

$6:1.7=x:10.2$

Cross products,

$(1.7)(x)=(6)(10.2)$

Simplify,

$1.7x=61.2$

Inverse operations,

$1.7x=61.2$

$/1.7$

$x=36$

3 0

3 years ago

A triangle is translated by using the rule (X.Y) =(x-4.y+1). Which describes how the figure is moved?

alexira [117]

Four units left and one unit up

7 0

3 years ago

Mrs Larsen made 12 pillows from 16 yards of the same fabric. How much fabric was used to make each pillow? between what two whol

Zepler [3.9K]

Yards per pillow.....yds/pillow....make sure u put the yds over the pillows when dividing

16/12 = 1.33 (or 1 1/3) yds per pillow....this lies between 1 and 2 yds

4 0

3 years ago

What is the approximate curcumfrance of the circle shown below?

Vikki [24]

Answer:

Step-by-step explanation:

Circumference=PI*diameter

Circumference=3.14*19.5

Circumference=61.23 rounds to 61.2 so the answer is C

3 0

3 years ago

Help help help please using the elimination solve this​

Help help help please using the elimination solve this