Question

solve the following system of equations : 3x - y = 7, 4x - 5y = 2​

Answer 1

Answer:

Step-by-step explanation:

First multiply the first equation by 5

So we get,

15x - 5y = 35.........(1)

Subtract (1) and 4x - 5y = 2

15x - 5y = 35

-4x + 5y = -2

———————————

11x = 33

So x = 3 ( by elimination method)

Then,

-4(3) + 5y = -2 ( subs the value of x in the send equation)

-12 + 5y = -2

5y = 10

y = 2

So, x = 3 and y = 2. Hope it will help you:)

Answer 2

3x-y=7......x5

4x-5y=2.....x1

15x-5y=35

4x-5y=2.

(-) (+) (-)

11x=33

x=33/11

x=3

substitute x=3 in any of the equation

4x-5y=2

4(3)-5y=2

12-5y=2

-5y=2-12

-5y=-10

y=-10/-5

y=2

hence x=3 and y=2