Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation.

15x - y = -6
5x - 3y = -13 (1 point)


5(-15x - 6) - 3y = -13
5(15x + 6) - 3y = -13
5x - 3(15x + 6) = -13
5x - 3(-15x - 6) = -13

Answer 1

we learned this last quarter but it wont let me go back to the class on my online school it said session has expired, i know ho to solve for x and y in systems of equations i dont know how to use the substitution mathod

Answer 2

how to*
method*

Answer 3

From the first equation find y in terms of y first:
15x - y = -6
y = 15x + 6
Put this y in the second equation: 5x - 3y = -13
5x - 3(15x + 6) = -13
5x - 45x - 18 = -13
-40x = 18 - 13 = 5
x = -5/40 = -1/8
put it in y = 15x + 6
y = 15(-1/8) + 6
y = (-15 + 48)/8 = 33/8

Answer 4

find y in terms of *x*

Answer 5

1 sec im looking over it im just slow i have to read it twice

Answer 6

Oh, they don't want the solution, just the substitution. So you can stop at line 5:
5x - 3(15x + 6) = -13

Answer 7

ok, hold on 1 sec (:

Answer 8

im still confused its not clicking in ym head

Answer 9

my*

Answer 10

i dont understand how i come to a conclusion of one of those answers.

Answer 11

wait oh o.e

Answer 12

i was looking at the wrong problem

Answer 13

nvm i get it now XD

Answer 14

ok.

Answer 15

i was looking at
4. Solve the following system of equations.

2x + 4y - 3z = -7
3x + y + 4z = -12
x + 3y + 4z = 4 (1 point)


(-6, -2, -1)
(6, -2, -1)
(-6, 2, 1)
(6, 2, 1)

Answer 16

ty for your help ^.^