Question

x+y=7
3x-2y=11

Answer 1

using elimination ? or substitution ?

Answer 2

any method

Answer 3

ok

Answer 4

(x+y)= 7
-3(x+y)= -3*7
-3x-3y=-21 now add them
3x-2y=11
-5y= -10
y = 2
x+2 = 7
x = 5

Answer 5

thanks

Answer 6

do you see what I did?

Answer 7

x=5

Answer 8

:)

Answer 9

multiply equation 1 with 2
2x+2y=14
now add the second equation with this
3x-2y=11
so
2x+3x+2y-2y=14+11
5x=25
x=5
put this in any of the original equation to get y

Answer 10

-4x+9=33

Answer 11

x+y=7......................1
3x-2y=11................2

from equation 1 x=7-y
now put into 2nd equation then get y then put into 1st equation.

Answer 12

x^2-18x+45 factor the polynomial completely