Question

solve: 3x-4y=9 and x+3y=4 ?​

Answer 1

Answer:

$\huge{\boxed{\rm{\pink{x=43/13 ; y=3/13}}}}$

Step-by-step explanation:

Given equations are:

3x-4y=9--------(1)

x+3y=4--------(2)

multiplying (2) with 3 then

3x+9y=12------(3)

Solving (1)&(3)

3x-4y=9

3x+9y=12

(-)

________

0-13y=-3

_______

=>-13y=-3

=>y=-3/-13

=>y=3/13

Substitute the value of y in (2) then

= x+3(3/13)=4

=>x+9/13=4

=>(13x+9)/13=4

=>13x+9=52

=>13x=52-9

=>13x=43

=>x=43/13

Values of X =43/13 and y=3/13