All categories

3 years ago

Solving simultaneous equations by algebraic methods 3a+4x=29 2a-3x=-9

1 answer:

4 0

3a+4x=29 (1st)
2a-3x=-9 (2nd)

multiply (1st) by 3 and (2nd) by 4

9a + 12x = 87 (1st)
8a - 12x = -36 (2nd)
---------------------add
17a = 51
a = 3

2a-3x=-9
2(3)-3x=-9
6 - 3x = -9
-3x = -15
x = 5

answer
x = 5 and a = 3

You might be interested in

What is the following product 3/x^2 4/x^3??

Alborosie

9514 1404 393

Answer:

12/x^5

Step-by-step explanation:

The fractions are multiplied in the usual way. The applicable rule of exponents is ...

(x^a)(x^b) = x^(a+b)

$\dfrac{3}{x^2}\cdot\dfrac{4}{x^3}=\dfrac{3\cdot4}{x^2\cdot x^3}=\dfrac{12}{x^{2+3}}=\boxed{\dfrac{12}{x^5}}$

7 0

3 years ago

The area of a triangle is found using the following formula:

Elena-2011 [213]

Answer:

12 in. 2

Step-by-step explanation:

3 x 8= 24

1/2. =0.5

24 x 0.5 = 12

8 0

3 years ago

Read 2 more answers

Ughhh please helpppp!!!!

Rom4ik [11]

Answer:

$\frac{2}{3}$

Step-by-step explanation:

4 : 6 = 2/3

8/3 : 4 = 2/3

16/9 : 8/3 = 2/3

4 0

2 years ago

How do you find the percent of a number greater than 100?

bonufazy [111]

Answer:

Multiply the number by the percent (e.g. 87 * 68 = 5916)

Divide the answer by 100 (Move decimal point two places to the left) (e.g. 5916/100 = 59.16)

Round to the desired precision (e.g. 59.16 rounded to the nearest whole number = 59)

Step-by-step explanation:

lets say for example 234

234/2 = 117 and the percentage were looking for is ummmm 25% well 25% is 1/4th of 234 making it 1/2 of 117 25% of 234 is 58.8 lets do a harder one what is 47% of 234 Divide n by 100.

Multiply the result by x. making it 109.98

4 0

3 years ago

Read 2 more answers

Write an integer to represent a score that is 7 under par

d1i1m1o1n [39]

-7 Good luck with other questions!

3 0

3 years ago