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

Que son las figuras planas

Alecsey [184]

It can be made through straight line or curved lines.

4 0

3 years ago

What is 1.3 repeating as a mixed number?

photoshop1234 [79]

The answer would
be 13/10

5 0

3 years ago

Can someone help me with this?

Lerok [7]

Answer:

1 is C and 2 is B

Step-by-step explanation:

4 0

3 years ago

Which property is represented below?<br> a = a

Vlada [557]

A = a is an example of Commutative Property.

I hope this helps you out Aydria01!

6 0

4 years ago

Which of the points listed below is not on the line with equation 7y+2=3x-5

kicyunya [14]

Answer: Second option.

Step-by-step explanation:

Given the folllowing Linear Equation:

$7y+2=3x-5$

You need to substitute the coordinates of each point given in the options into the equation and then evaluate.

1) Substituting $(2, -\frac{1}{7})$ into the equation, you get:

$7(-\frac{1}{7})+2=3(2)-5\\\\-1+2=6-5\\\\1=1\ (TRUE)$

2) Substituting the point $(3, -\frac{3}{7})$ . you get:

$7(-\frac{3}{7})+2=3(3)-5\\\\-3+2=9-5\\\\-1=4\ (FALSE)$

3) Apply the same procedure using the point $(1, -\frac{4}{7})$ :

$7(-\frac{4}{7})+2=3(1)-5\\\\-4+2=3-5\\\\-2=-2\ (TRUE)$

4) Apply the same procedure using the point $(-1, -\frac{10}{7})$

$7(-\frac{10}{7})+2=3(-1)-5\\\\-10+2=-3-5\\\\-8=-8\ (TRUE)$

5) Substituting $(0,-1)$ into the equation:

$7(-1)+2=3(0)-5\\\\-7+2=-0-5\\\\-5=-5\ (TRUE)$

Therefore, the point $(3, -\frac{3}{7})$ is not on the given line.

8 0

3 years ago

Help help help please using the elimination solve this​

Help help help please using the elimination solve this