Question

Use substitution to solve the system

3x − y = 5
2x + 3y = −4

(x,y)= ( , )

Answer 1

solve the first eqn for y
y=3x-5 (*)
sub this expression for x into eqn 2
2(3x-5)+3y=-4
solve for y
6x-10+3y=-4
9x=6
x=2/3
sub 2/3 for x in (*)
y=3(2/3)-5=2-5=-3

the solution is (2/3, -3)

Answer 2

lol i did a problem ezactly like tis on a quiz today...

Answer 3

y=3x-5 (*)
should go into 2x + 3y= -4

Answer 4

so you should solve
2x + 3(3x-5) = -4

Answer 5

ur correct; i think its time to quite for the night!

Answer 6

It's easy to get wrapped around the axle sometimes!

Answer 7

good night mandolino

Answer 8

solve the first eqn for y
y=3x-5 (*)
sub this expression for x into eqn 2
2x+3(3x-5)=-4
solve for y
2x+9x-15=-4
11x=11
x=1
sub 1 for x in (*)
y=3(1)-5=3-5=-2

the solution is (1, -2)

Answer 9

g'night :})

Answer 10

thanks guys!!!

Answer 11

and goodman what school do u go to??

Answer 12

JAMES LOGAN HIGH SCHOOL

Answer 13

why?

Answer 14

i was thinking we went to the same college because everyone has to take the same quize over the internet in my class, that has the same questions and its due tonight at like midnight, i just thouht there could be a chance, that would be sweet if true

Answer 15

lol..college..im only a freshman still good to know u!

Answer 16

you could easily be in my college class, i bet u would think it easy, its math 110, but its hard for me,my tallents not math

Answer 17

me too..im in alg 2 and have the worst teacher...