Use the substitution to solve the system of equations

y = - 2x

x-3y=21

How do you graph y=x^3+9x? like the key features

Suppose we know two of the three people have Alzheimer's disease. What is the conditional probability that they are both younger than 80 years of age?

What would be the slope of a line perpendicular to y=2x + 1 be?

Crystal completed 1/3 of her homework assignment on Friday and 3/7 of her assignment on Saturday. what is the amount of her assignment that she has left to complete?

3 (2x + 12) = - 2 (x - 4) + x

What is the square root of 12 plus the square root of 27?

Which statement is true about left parenthesis square root of 3 space space space plus space 5 right parenthesis space5? Answer choices: A. It is rational number because the product of two rational numbers is a rational. B.

What is 35 percent of 80

The larger of two numbers is five more than twice the smaller. The difference is thirteen. Find numbers.

If you flip a fair coin 4 times, what is the probability that you will get exactly 2 tails?