Question

7x+5y=-3
-9x+y=-11 solve linear system.

Answer 1

x or y?

Answer 2

its just like you have to find x and y and it works on both equation using the same x and y

Answer 3

both x and y

Answer 4

7x + 5y = -3
-9x + y = -11 (multiply this equation by 5 so the y's are the same)

so it
7x + 5y = -3
-45x + 5y = -55

then subtract the two equations to get rid of the y's so it becomes,
52x = -3 -(-55)
52x = 52
x = 1
sub x in any of the two equations to find y,
|so 7(1) + 5y = -3
5y= -10
y = -2

Answer 5

o_o its confusing~~what if its a fraction 3/4x+1/4y=13/2 x-3/4y=13/2

Answer 6

multiply to get rid of the fraction

Answer 7

lowest common denominator, so in this case, multiply by 4 to get rid of the denominator

Answer 8

SO YOU TIMES 4 BY ALL THE #

Answer 9

yep

Answer 10

so the first equation becomes,3x + y = 26

Answer 11

write out my answer for the first one, it should help

Answer 12

3x+1=26 4x-3y=26

Answer 13

then~~what do i do?

Answer 14

do the same thing i did above, multiply the first equation by 3 and then add them to get rid of the y's. note it shud be 3x + y = 26

Answer 15

i got 3x + y = 26 and 4x-3y=26 by multiplying by 4..then i multiply what?

Answer 16

do the same thing i did above, multiply the first equation by 3 and then add them to get rid of the y's. note it shud be 3x + y = 26

Answer 17

you want to have the same number of x's or y's so you can eliminate one of them by adding or subtracting.

Answer 18

in order to solve for the other variable.

Answer 19

you mulitiply 3x+y=26 or the original equation by 3?