Question

please solve n find x and y
-4x+4y=160
3y-7x=180
please solve it step by step​

Answer 1

Answer:

x = 15

y = 55

Step-by-step explanation:

-4x + 4y = 160

Devide above equation by 4, we get

-x + y = 40 ---(1)

Now, 3y - 7x = 180 can also be written as

-7x + 3y = 180 ---(2)

Multiplying eq (1) by 3, we get

-3x + 3y = 120 ---(3)

Now, subtracting eq (3) from eq(2). -7x + 3y - 180 = 0

+3x - 3y + 120 = 0

After subtracting, we get

4x - 60 = 0

4x = 60

x = 60/4

x = 15

Now, putting value of x in eq (1), we get

-(15) + y = 40

y -15 = 40

y = 55

Answer 2

Answer:

x=-15,y=25

Step-by-step explanation:

-4x+4y=160

-4(x-y)=160

x-y=-40 ——(1)

3y-7x=180

-7x+3y=180——(2)

By elimination method:-

x-y=-40——(1)×3

-7x+3y=180——(2)×1

We get,

3x-3y=-120

-7x+3y=180

——————

-4x=60

x=-15

Put this value in eq.(1)

x-y=-40

-15-y=-40

y=40-15

y=25

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