Question

Solve this system of equations using substitution. Put your answer in ordered pair form, (x, y).
x+2y=8
2x+y=7

Answer 1

what do you see that we could relate y to x with?

Answer 2

in other words, solve one of the equations for y or x,

Answer 3

so like but a number in and solve

Answer 4

x = 8 - 2y , replace x with this value in the second equation. You get 16 - 4 y +y = 7.
so you get y and then x

Answer 5

not a number so much as just a relationship; we need to be able to express "y" in terms of "x"; or the other way around

Answer 6

??? can you explain more please i dnt have a teacher for this class and need lots of help

Answer 7

these equation share a common value for their x and y; we can use that to our advantage by using one to express a relationship between x and y

x+2y=8 ; x = 8-2y or 2y = 8 - x


we can use this

Answer 8

take the other equation:

2x+y=7 and use what we know in it: lets use x= 8-2y

2(8-2y) +y = 7

Answer 9

o so i subtract from both sides

Answer 10

you algebra it into a relation between x and y; x = this; or y= that

Answer 11

o ok thx very much for your help

Answer 12

youre welcome