Solve this system of linear equations. separate the x-and y-values with a comma.
-2x=8-6y
-15x=21-6y

(x,y)=-(1,1)

Step-by-step explanation:

-2x=8-6y (divide by -2)

=> x=-4+3y

-15x=21-6y (divide by -3 for simplicity)

=>5x=-7+2y

We know that  x=-4+3y, insert this into expression "5x=-7+2y"

5(-4+3y)=-7+2y

-20+15y=-7+2y

15y-2y=20-7

13y=13

y=1

Since x=-4+3y we can find x by using y=-1

x=-4+3(1)

x=-1

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.