All categories

3 years ago

Use this system of linear equations to solve for x. 3x+5y=6 and 2x+y=4

Mathematics

2 answers:

Oduvanchick [21]3 years ago

8 0

Answer:

x=2

HPT 3x+5y=6 (1) và 2x+y=4 (2)

Nhân phương trình (2) với 5 để hệ số y của 2 phương trình bằng nhau. Ta có:

(2)⇔ 10x+5y=20(3)

Trừ (3) cho (1), có: 7x+0y=14⇒x=2

svp [43]3 years ago

4 0

Answer:

3x+5y=6.....eqn 1

2x+y=4.......eqn 2

y=4-2x.....eqn 3

Step-by-step explanation:

substitute eqn 3 into eqn 1

3x+5(4-2x)=6

3x+20-10x=6

-7x = -14

x=2

You might be interested in

If dave buys a sample of 70 nails and 6 are bad and 64 are good and he needs 2500 good nails how many nails should dave buy

dexar [7]

Answer:

$Dave\ should\ buy\ 2735\ nails.$

Step-by-step explanation:

$Number\ of\ nails=70\\\\Good\ nails=64\\\\percentage\ of\ good\ nails=\frac{good\ nails}{total\ nails}\times 100\\\\percentage\ of\ good\ nails=\frac{64}{70}\times 100\\\\percentage\ of\ good\ nails=91.42857\%\\\\Let\ for\ 2500\ good\ nails\ he\ has\ to\ buy\ x\ nails\\\\91.42857\%\ of\ x=2500\\\\\frac{91.42857}{100}\times x=2500\\\\x=\frac{2500}{0.9142857}=2734.375\\\\x\approx 2735$

5 0

3 years ago

Solve the equation 7x-2(x-10)=40

bekas [8.4K]

Answer:

−

(

−

)

7x{\color{#c92786}{-2(x-10)}}=40

7x−2(x−10)=40

−

Step-by-step explanation: therefore your answer would be x=4

BRAINLIEST PLEASE

5 0

2 years ago

Read 2 more answers

Question 5 (5 points)

vivado [14]

Answer:

$(x-9.291)\cdot (x + 1.292)$

Step-by-step explanation:

The factors of the given polynomial ( $x^{2}-8\cdot x - 12$ ) are derived from the General Formula for Second-Order Polynomials:

$x = \frac{8 \pm \sqrt{64 - 4\cdot (1)\cdot (-12)}}{2\cdot (1)}$

$x_{1} \approx 9.291$ and $x_{2} \approx -1.292$

The factors of the polynomial are:

$(x-9.291)\cdot (x + 1.292)$

5 0

3 years ago

Read 2 more answers

Shanda says that 393 is rational. Allison and Franklin disagree with her. Allison says 393 is an integer while franklin says its

Mashutka [201]

Answer:

the answer is rational

Step-by-step explanation:

if i am wrong i am very sorry but that is what i have learned so again if i'm wrong sorry

8 0

3 years ago

A salesman makes both a base salary and also a commission, which is a percentage of what he sells. Each month, if his sales tota

ss7ja [257]

Linear equation is the equation in which the highest power of the unknown variable is one.

The given equation the constant 2000 represents the base salary or the fixed salary of the salesman.

To find that what does 2000 represent in the given linear equation we need to know about the linear equation.

<h3>What is linear equation?</h3>

Linear equation is the equation in which the highest power of the unknown variable is one.

Given information-

Total sales by salesman each month is $s$ dollars.

The total money made by the salesman each month by selling goods of $s$ dollars given by,

$S=2000+0.1s$

The above equation given in the problem is the linear equation. In this linear equation the salary of salesman depends on his sales.

The constant amount of $2000 is the fixed amount of the salesman.

The variable $s$ is the variable on which the salary of the salesman depends. Thus due to this variable the salary of the salesman changes.

Hence in the given equation the constant 2000 represents the base salary or the fixed salary of the salesman.

Learn more about the linear equation.

brainly.com/question/14323743

4 0

2 years ago

Use this system of linear equations to solve for x. 3x+5y=6 and 2x+y=4​

Use this system of linear equations to solve for x. 3x+5y=6 and 2x+y=4