it is a because, you can have 30 baseball cards, and six packages, so imagine this has six bags full of a certain amount of candy, and there is 30 pieces of candy, and do you want to separate them into an even amount, so this would be 30÷6= ? The? Would be 5 as in to say The constant of proportionality would also be 5.
We are given that -x-10y=2 is a true equation so by multiplication property of equality, we can multiply everything by -3 on both sides. This gives us 3x+10y=-6