brittanyjacob8
01.08.2019 •
Mathematics
What is the solution of the system? use either the substitution method or the elimination method. 7x + 2y = −19 −x + 2y = 21
Solved
Show answers
More tips
- O Other How to Accidentally Get a Rare Coin with Your Change and How to Know Its Value?...
- S Society and Politics How Could Nobody Know About the Dead Mountaineers?...
- D Dating, Love, Relationships Why do we feel shame?...
- F Family and Home Why Does God Punish Us Constantly and How Can We Fix It?...
- F Family and Home Do Lullabies Help Babies Sleep or Is it Just a Myth?...
- B Business and Finance How to Get Your Money Back When Lending? Top 7 Ways...
- S Society and Politics Выборы: Смысл, Значение и Отражение...
- D Dating, Love, Relationships Why Should the Man be Active and the Woman Passive during Foreplay?...
- P Philosophy How did the concept of module arise in computer science?...
- S Society and Politics Why are thugs called gopniks ? A fascinating journey through Russian subculture...
Answers on questions: Mathematics
- M Mathematics Which mathematicians first used the symbol pi why?...
- M Mathematics Very hard for me and important! the indicated airspeed s (in knots) of an airplane is given by an airspeed indicator that measures the difference p (in inches of mercury)...
- M Mathematics What can be concluded of the graphed polygon? a. the slope of side a is -3/5 b. the opposite sides of the polygon are parallel. c. the adjacent sides of the polygon are...
- M Mathematics What is the midpoint of the line segment with endpoints (1,-6) and (-3,4)? o a. (-1,-1) o b. (-1,-2) o c. (-2,-1) o d. (-2,-2) submit...
- M Mathematics What is the interquartile range of the data below. the number are 6,12,14,24...
- M Mathematics The following expression has been simplified one step at a time. match each step with the property used to get to that step. (note: the column that lists the algebraic expressions...
- M Mathematics Using the given points and line, determine the slope of the line. (-3, 0) and (2, 7) slope = -7/5 slope = -5/7 slope = 5/7 slope = 7/5...
- M Mathematics Is the percent of change from 134 to 106? round to the nearest percent!...
- M Mathematics What is the coefficient of (-2/3x)()...
- M Mathematics Solve the system of equations. What is the value of a that makes the system of equations true?...
Ответ:
{7 x + 2 y = -19 | (equation 1)
{2 y - x = 21 | (equation 2)
Add 1/7 × (equation 1) to equation 2:
{7 x + 2 y = -19 | (equation 1)
{0 x+(16 y)/7 = 128/7 | (equation 2)
Multiply equation 2 by 7/16:
{7 x + 2 y = -19 | (equation 1)
{0 x+y = 8 | (equation 2)
Subtract 2 × (equation 2) from equation 1:
{7 x+0 y = -35 | (equation 1)
{0 x+y = 8 | (equation 2)
Divide equation 1 by 7:
{x+0 y = -5 | (equation 1)
{0 x+y = 8 | (equation 2)
Collect results:
{x = -5, y = 8
Ответ:
Download the app Microsoft maths app.
It is helpful in maths problems.