5x + 10y = 18
x = y - 6
which of the following equations is the result of substituting y - 6 in for x in the first equation?

5x + 10y - 6 = 18
5y - 6 + 10y = 18
5y - 30 + 10y = 18

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle?