Question

if x=0 then find value of 3x-4y=-7

Answer 1

if x=0 then 3(x)-4y=73(0)-4y=7-4y=7y=1.75

Answer 2

...3x-4y=-7
-4y=-7-3x
-4y=-7-3(0). by putting the value of x
-4y=-7. because -3*0=0
y=-7/-4. canceling the (-)
y=7/4


it's ur answer I hope may be it helps you.