Question

When using the substitution method, what expression for x in the first equation would be substituted in the second equation?

x + 3y = –7
2x + 4y = –4

3y – 7

–3y – 7

3y + 7

–3y + 7

Answer 1

@85295james

Answer 2

x=8
y=-5

Answer 3

would it be the second choice

Answer 4

i think the first one ??????????????? sorry

Answer 5

from first equation,
x+3y=-7
subtract 3y from both sides, so
x+3y-3y=-3y-7
x+0=-3y-7
x=-3y-7
so 2nd choice :)

Answer 6

thankyou

Answer 7

could u help me with this one

Sam and Chris went to “Lots O Fun” to play laser tag and video games for Chris’s birthday. Sam played 3 games of laser tag, 5 video games, and spent $17 total. Chris played 4 games of laser tag, 7 video games, and spent $23 total. How much does one video game cost to play?

$1

$2

$3

$4

Answer 8

let laser tag cost x $ and video game cost y $.
so u can form the equations :
3x+5y = 17
4x+7y = 23
just solve these 2 equations and find the value of y. that would be your answer.

Answer 9

$2

Answer 10

oh ok'

Answer 11

lol its $ 1
when u solve :P

Answer 12

o $hit sorry

Answer 13

i got the same answer

Answer 14

hehehe

Answer 15

i have one more

2x – 7y = 1
x – 8y = –4

(2, 4)

(4, 2)

(1, 4)

(4, 1)

Answer 16

4,1

Answer 17

yup :)

Answer 18

can you just open a new one i love medals lol

Answer 19

yaya

Answer 20

cool