M .  use substitution method to solve the system of equations. choose the correct ordered pair. 2x - y=10 and 2x - 2y =4

You can make the first equation equal to x: x=0.5y+5 and substitute it into the second equation: 2(0.5x+5)-2y=4 -> -y+10=4 so y=6.

Then plug y into either equation: 2x-(6)=10 -> x=8

The correct ordered pair is (8,6)

The answer for you question is b

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.