What is the result of subtracting the second equation from the first? \begin{aligned} -2x+y &= 0 -7x+3y &= 2 \end{aligned}
−2x+y
−7x+3y


=0
=2

What are the soultion(s) to the quadratic equation 40- x^2=0

X+y=-4 x-y=2 use elimination with adding and subtraction

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years