PrincessTatianaPulou
PrincessTatianaPulou PrincessTatianaPulou
  • 02-03-2019
  • Mathematics
contestada

whats the solution for 7x−y=7 x+2y=6 ​

Respuesta :

akephd
akephd akephd
  • 02-03-2019
Multiply the first equation by 2 to then use elimination by adding the 2 equations.
So, 14x-2y=14
+. x+2y=6

Equals 15x=20 so x=20/15=4/3

Plug in to first equation to get y
7(4/3)-y=7
28/3-y=7
28/3-y=21/3
So y=7/3

Plug both x and y into second equation to check
4/3+2(7/3)=
4/3+14/3=18/3=6 it works

So x=4/3, y=7/3
Answer Link

Otras preguntas

(10y^3+20y^2+55y)/5y
Find Domain of the functionsquare root of (x-8)/x(x-9)
Data are drawn from a symmetric and bell shaped distribution with a mean of 120 and a standard deviation of 5. There are 900 observations in the data set. What
How is it possible for Mercury to have frozen ice ?
Data are drawn from a symmetric and bell shaped distribution with a mean of 120 and a standard deviation of 5. There are 900 observations in the data set. What
(10y^3+20y^2+55y)/5y
Which equation has the same y-intercept as y=4x-3?a. y-3=x              b. y=8x+3    c. 3-y=4x      d. y=-3+8xWhich of the following is the equation of the line
Scarcity is the condition of not having enough goods and services to satisfy everyone's?
Historians of china have traditionally dated the beginning of Chinese civilization to the founding of the what??
find an equivalent expression without parentheses -(50x-15y+15)=