Question

x-3y=35,2x+4y=28 solve by multiplication method​

Answer 1

Answer:x=22.4

y= -4.2

Step-by-step explanation:

x-3y=35    ...eq1

2x+4y=28    ...eq2

multiply eq1 by 2

2x-6y=70  ...eq3

then sub eq3 for eq2

(2x-6y)-(2x+4y)=70-28

-10y=42

y= -4.2

put y=-4.2

x-3× -4.2=35

x+12.6=35

x=35-12.6

x=22.4

Answer 2

Answer:

x = 22.4, y= - 4.2

Step-by-step explanation:

2 x + 4 y = 28___(1)

x - 3 y = 35

=> x = 3 y + 35 ____(2)

sub. eq (2) in eq (1), we get,

2 ( 3 y + 35 ) + 4 y = 28

=> 6 y + 70 + 4 y = 28

=> 10 y = - 42

=> y = 21 / 5 = - 4.2

sub. this in eq (2), we get

x = - 12.6 + 35

=> x = 22.4