Question

Solve the given system, using the substitution method.

y = 3x – 4
9x – 3y = 14


A.
There is no solution.

B.
(12, 14)

C.
(14, 12)

D.
There are an infinite number of solutions.

help pleasee :)

Answer 1

to use the substitution method use the expression for one variable from the first equation into the second equation and then solve for the one variable in your new equation. with this value put in expression to get the actual value.
for this problem equation 1 you have y =
replace y in the second equation with this expression
9x - 3(3x - 4) = 14
solve for x
put this value of x in y = 3x - 4 to get the value of y

Answer 2

i still dont get it.... @triciaal

Answer 3

when you substitute you replace
for example if y = 3x and x = 2 then y = 3 times 2 because you replace the x with 2
do you see that ?

Answer 4

sort of @triciaal

Answer 5

you don't need to put "@triciaal"

anyway its the same principle
the first equation has y = an expression then in the 2nd equation where you have y you replace y with the expression

Answer 6

this is so confusing