Question

y = 4x + 9
y = x

solve by substitution. please help!

Answer 1

since y = x you can write x for y in the first equation

x = 4x + 9
x - 4x = 9
-3x = 9
x = -3

Answer 2

how did you get -4 ?

Answer 3

and -3x ?

Answer 4

got it , thank you!!!!!!!!!!! :)

Answer 5

i need help in one more question, if you have time?

Answer 6

ya

Answer 7

y = -3x - 5
y = 4x + 9

Answer 8

be right back, but you can show me how to do it, and ill give u a medal when i come back (10 mins) thank you!

Answer 9

we can calute be substitution method ....4x+9=-3x-5 4x-3x=-5-9 x=-14 now we get x=-14 put the vaue of x we get value of y\].

Answer 10

@justinee u undrstand

Answer 11

yes, but why is it 4x - 3x ?