Question

Use substitution to solve the system.


Use the substitution method..
5x-3y=21
y=2x-8

What does x and y equal

Answer 1

so 5x -3 (2x-8) = 21
5x - 6x + 24 =21
-x = -3
x = 3
and
y = 2(3) -8 = -2

Answer 2

OMG thank you so much I have two more problems like these.. Can you answer them for me

Answer 3

sure

Answer 4

3y-11=x
3x+5y=9

Answer 5

hello

Answer 6

3y-11=x
3x+5y=9
3(3y-11)+5y=9
9y-33+5y=9
14y=9+33
14y=42
y=42/14=3
x=3y-11=3*3-11=9-11=-2

Answer 7

y=3 and x=-2

Answer 8

omg thank you so much

Answer 9

I have one more, will you help me

Answer 10

sure ^_^

Answer 11

-2x+y=1
5x+4y=17

Answer 12

please help @shahd-owies

Answer 13

rearrange the first to give: y = 1 + 2x
then
5x + 4(1 + 2x) = 17
5x + 4 + 8x = 17
13x = 13
x =1

y = 1 + 2x = 1 + 2(1) = 3

Answer 14

-2x+y=1
y=1+2x
5x+4y=17
5x+4(1+2x)=17
5x+4+8x=17
13x=13 so x=1
y=1+2x=1+2=3
y=3

Answer 15

thanks so much you guys