grandmamom12 grandmamom12

01-05-2017
Mathematics

contestada

Use substitution to solve for x in the system of equations.

10x + 2y = 30
4x + y = 4

A. x = -11

B. x = 11

C. x = 13

D. x = 15

Respuesta :

02-05-2017

Equation 1) 10x + 2y = 30
Equation 2) 4x + y = 4

Multiply all of equation 2 by 2.

2) 2(4x + y = 4)

2) 8x + 2y = 8
1) 10x + 2y = 30

Subtract equations from each other.

-2x = -22

Divide both sides by -2.

x = -22/-2

x = 11

B) x = 11

~Hope I helped!~

Answer Link

Otras preguntas

Find the slope of the line containing the two points. (0,3),(4,0) Please show work

Authors often create special meanings for certain objects, animals, or even human characters so they represent and convey a particular idea to the reader whenev

To convert from K to °C: T(°C) = T(K) - 273.15

what happens to electrons in photoelectric phase

What is the GCF for 21

Find 3 consecutive even integers whose sum is 2

Rita is a registered dietician. What does her work entail? A. prescribing medication for clients B. cooking healthy meals for students C. demonstrating how t

A district attorney ____________________. Question 45 options: represents suspected law breakers in court decides criminal cases runs the court system at the co

A student is extracting caffeine from water with dichloromethane. The K value is 4.6. If the student starts with a total of 40 mg of caffeine in 2 mL of water a

-1 2/3 + (-2 1/6) Use the real number properties to write an equivalent expression for this sum.