Question

3x+11=y x+y=3 system of linear equations subsitution

Answer 1

like this?
3x+11x+y=3

Answer 2

or like this?
3x+11 = ?
x+y=3

Answer 3

3x+11=y

Answer 4

3x+11=y
x+y=3

Answer 5

substitution means we take one of the two equations, set it equal to 'x' then plug it into the other equation.

set the equation x+y=3, equal to x
x+y=3 [subtract y from both sides]
x+y-y = 3-y
x=3-y

now substitute this value of 3-y in place of 'x' in the equation 3x+11=y