Question

how to substitute (1) in (2)?

Answer 1

multiply eq 2 by 2
10(y+240)=4x
3y=4x
subtract both ek
10y+2400-3y=4x-4x
7y+2400=0
7y=-2400
y=-2400/7
y=342.7
on putting y=342.7 then value of x come

Answer 2

3y = 4x

then , y = $\frac{4}{3}$x

5(y + 240) = 2x

$\frac{20}{3}$x + 1200 = 2x

20x + 3600 = 6x

-14x = 3600

plz check answer .... step is right but solution may be wrong