Question

-7x – 4y = -15
-7x – 3y = -13

Answer 1

Do you need to find x and y?

Answer 2

yes

Answer 3

Solve one of the equation for x or y and sub it into the other one to replace the solved for variable. So, if you were to solve the 1st equation for y, it would be y= (15/4)-(7/4)x

Answer 4

the answerwould be 3

Answer 5

Yup.

Answer 6

what about the 2 equation

Answer 7

to find y make x =0
to find x plug the number that you found for y in the equation ..

Answer 8

i got 1

Answer 9

for the first eq it would be -7(0)-4y=-15 then -4=-15 , so y = -15 /-4 which gives 15/4

Answer 10

since you have y = 15/4 plug this in the eq to find x

Answer 11

so what are the two ansers

Answer 12

15/4 7

Answer 13

can i see the question ?

Answer 14

solve a system using elimination and those two equations

Answer 15

ok

Answer 16

first step you should cancel or remove y or x in both equations

Answer 17

for example you have :-7x – 4y = -15
-7x – 3y = -13 .. since x in both equations have the same number its easier that y to cancel .. right ?

Answer 18

but before you cancel x you have to multiply one of the equations by +1 to get one x has a positive number and the other one has a negative number which is -7 and +7

Answer 19

then

Answer 20

its the same as the following example 2x + y = 9
3x – y = 16

Note that, if I add down, the y's will cancel out. So I'll draw an "equals" bar under the system, and add down:

2x + y = 9
3x – y = 16
5x = 25

Now I can divide through to solve for x = 5, and then back-solve, using either of the original equations, to find the value of y. The first equation has smaller numbers, so I'll back-solve in that one:

2(5) + y = 9
10 + y = 9
y = –1

Then the solution is (x, y) = (5, –1).

Answer 21

the answer was 1,2