Question

x + 2y = 10
3x + 4y = 8

Which point is the solution to the system of equations?
A)(7, 1.5)
B)(11,-12)
C)(-11, -12)
D)(-12, 11)

Answer 1

@Spectrum

Answer 2

Solve for x in the first equation and then plug in that solution into the x in the second equation. Then just solve for the y-value. Then plug that y-value into any of the two equations and solve for x.

Answer 3

huuuh ?

Answer 4

Solve for x in x+2y=10

Answer 5

how ? by subtracting 2Y?

Answer 6

Yes

Answer 7

X is understood to be 1

Answer 8

@Twis7ed

Answer 9

What? Just subtract 2y from both sides so you end up with x = 10 - 2y. Do you understand that?

Answer 10

right i got that well then you have to divide by the number infront of X and there isnt one so itnt it understood to be 1

Answer 11

yes, and you have the value for x which is (10-2y).
Use (10-2y) in the second equation. that is what he is saying.

Answer 12

so it would be like 3(10-2y)+4y=8

Answer 13

@franciscanmonk

Answer 14

omg i need someone whho makes sence like @some_someone or @bahrom7893 or @Spectrum

Answer 15

Do I make sense?

Answer 16

yes , you did in my last question you answered

Answer 17

'so it would be like 3(10-2y)+4y=8' <--- This one is good.
Solve this
get the value for y
solve for x in either the first or second equation.

Answer 18

x+2y=10
Subtract 2y from both sides:
x+2y -2y = 10 -2y

Answer 19

got that baharom ! so i multiply the 3 by 10-2y ?

Answer 20

So now you have:
x=10-2y
Since you know that 3x + 4y = 8
and x=10-2y, you know that:
3*(10-2y) + 4y = 8

Answer 21

alright so that equals 30-6y+4y=8 then i combine like terms which are 6y and 4y which equal 10y ?

Answer 22

yea so
30-6y+4y=8
30-2y=8
-2y=8-30
-2y=-22
y=11

Answer 23

X=12 right ?

Answer 24

answer is 11,-12

Answer 25

x=10-2y = 10-2*11 = 10-22 = -12

Answer 26

its D

Answer 27

no

Answer 28

In coordinate form you write (x,y) so it's B

Answer 29

i clicked b , it said i was wrong