Question

Solve this system of equations by using substitution.

3x + y = -6
y = x + 10
The answer (x,y)

Answer 1

@thomaster

Answer 2

@Hero

Answer 3

@amistre64

Answer 4

they tell you what y is equal to ... so substitute that into all y parts

Answer 5

y = x + 10


3x + y = -6
y = x + 10


3x + (x + 10) = -6
x + 10 = x + 10

the second equation is always true so the only useful one we can use is the first equation ... solve for x

when we know what the number value of x is, we still know that y = x+10