Question

solve by substitution method 3x+4y=18. x=30-4y

Answer 1

x=-6
y=9

Answer 2

3 ( 30 - 4y) + 4y = 18

Answer 3

can u show me the steps. it got to where i plug is 30-4y

Answer 4

U have to substitute the x by the value 30 - 4y

Answer 5

3x + 4y = 18 and x = 30 - 4y
so replace the x of 3x by (30 - 4y)
3(30 - 4y) + 4y = 18
90 - 12y + 4y = 18
-8y = 18-90
y = -72/-8
y = 9

Answer 6

yea ive gotten to where I sub that in. do i combine like terms next

Answer 7

put y=9 in other equation

Answer 8

awsome ive gotten those steps down .

Answer 9

now put y = 9 in 3x + 4y = 18
3x + 4(9) = 18
3x = 18-36
x = -18/3
x = -6

Answer 10

@tena
i hv posted the detailed solution above..........
got a GOOD ANS

Answer 11

i actually got this right lol

Answer 12

good for u then....

Answer 13

thanks soo much so the solution is (-6,9) or is the other way around

Answer 14

thank u for the medal

Answer 15

your welcome thanks soo much. my exam is stressing me out, so im trying to make sure the answers i have are correct.