1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vovangra [49]
3 years ago
5

Solve the system of equations by substitution. y = 5x - 13 4x + 3y = 18 The solution is

Mathematics
1 answer:
Rudik [331]3 years ago
3 0

Answer:

x=3 and y=2

Step-by-step explanation:

1.) 4x+3(5x-13)=18

expand into 4x+15x-39=18

18+39= 57

15x+4x= 19x

57/19= 3 so x=3

substitute 3 into y= 5x - 13

and you get 2 so y=2

You might be interested in
How do you solve 7 (6x + 2)?​
Lerok [7]

Answer:

42x + 14​

Step-by-step explanation:

to  solve this type of question , all you have to do is to follow some simple rule of BODMAS

B.............. bracket open

O.............. of

D................ division

M.................multiplication

A................... Addition

S........................... Subtraction.

so we are just going to apply the B

7 (6x + 2)

42x + 14​

4 0
3 years ago
Read 2 more answers
I need some help please! ^_^
Degger [83]
Perpendicular lines will have negative reciprocal slopes. What that means is if u have a slope of 1/2, to find the negative reciprocal, flip the slope and change the sign.......flip 2/1, change the sign -2/1 or just -2. So the negative reciprocal for the slope of 1/2 is -2. 

A. y = 1/5x + 3.....slope here is 1/5, so for a perpendicular line, u r gonna need an equation with the slope of -5.....and that would be : y + 3 = -5(x + 2).

B. Parallel lines will have the same slope. y = 5x - 2...the slope here is 5...so a parallel line will have a slope of 5.

y = mx + b
slope(m) = 5
(8,-2)...x = 8 and y = -2
now we sub, we r looking for b, the y intercept
-2 = 5(8) + b
-2 = 40 + b
-2 - 40 = b
-42 = b

so ur parallel equation is : y = 5x -42
7 0
3 years ago
Brianna is a waitress in an upscale restaurant. On Friday she waited on 12 groups of customers who spent an average of $186 per
givi [52]

Given :

Brianna is a waitress in an upscale restaurant. On Friday she waited on 12 groups of customers who spent an average of $186 per group.

Her tips averaged 18% of the total amount spent by all the groups of customers that day.

To Find :

Brianna's tip income earnings on Friday.

Solution :

Total amount of money spent by 12 groups :

P = $ 12×186 = $2232 .

She got tip of 18% of the total amount spent by all the groups of customers.

T = P\times \dfrac{20}{100}\\\\T= 2232\times \dfrac{20}{100}\\\\T=\$446.4

Brianna's tip income earnings on Friday is $446.4 .

Hence, this is the required solution.

4 0
3 years ago
x^2+2x+7=21 the approximate value of the greatest solutoon to the equation, rounded to the nearest hundreth​
daser333 [38]

9514 1404 393

Answer:

  x ≈ 2.87

Step-by-step explanation:

We  can subtract 6 to put the equation into a form easily solved.

  x^2 +2x +1 = 15

  (x +1)^2 = 15

  x +1 = √15 . . . . . for the greatest solution, we only need the positive root

  x = √15 -1 ≈ 2.87

4 0
2 years ago
An amount was shared in the ratio 8:6:9:14:12.The largest share was56.What was the total amount shared?
lutik1710 [3]

Answer:

196

Step-by-step explanation:

Since the largest share was 56 and the largest ratio is 14, then

56 ÷ 14 = 4 ← value of 1 part of the share, thus

8 parts = 8 × 4 = 32

6 parts = 6 × 4 = 24

9 parts = 9 × 4 = 36

14 parts = 14 × 4 = 56

12 parts = 12 × 4 = 48

Total the amounts

total = 32 + 24 + 36 + 56 + 48 = 196

6 0
3 years ago
Other questions:
  • Solve for x in the triangle round your answer to the nearest tenth
    6·1 answer
  • How many tens and ones are in the number 15
    6·1 answer
  • Chris estimated the product of 37 and 86 by multiplying 40x90.Tell how you know if this is greater than or less than the actual
    12·1 answer
  • Tell what you would do to isolate the variable.
    13·1 answer
  • Which transformation will always map a parallelogram onto itself
    7·2 answers
  • Which of these is another way to show the number 4.215?
    15·1 answer
  • Which set of numbers could be the side length of a right tirangle
    14·1 answer
  • 3(x+7) simplify the expressions
    12·2 answers
  • 3) What operation do you need to use when you factor out the greatest
    13·1 answer
  • 3plss help, it times;;;;;;;;;;;;;;;;;;;;;;;;;
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!