Question

Solve.
3x + 4y = 4
5x+7y=4​

Answer 1

Step-by-step explanation:

3x+4y=4. =. 15x+20y=20

5x+7y=4. =. 15x+21y=12

---------------------. (subtraction)

-y=8

y=-8

3x+4y=4. =>3x+4(-8)=4

3x-32=4. =>. 3x=36. =>. x= 12

therefore. x=12 and y =-8

Answer 2

Step-by-step explanation:

3x+4y=4

5x+7y=4

multiply the first eq by 5 and secnd eq by 3.

we get,

15x+20y= 20 -----3

15x+21y=12---------4and

equation 3-4 implies

y=-8 and x=12