X+y=10 x-y=20 how do you solving systems of equations with elimination

What is the product? (x2+3y+7) [yy+1)

If the car had not hit the fence, how much farther would it have skidded? solve the skid-distance formula to find the extra distance that the car would have traveled if it had not hit the fence. round your answer to two decimal places. note that unit conversion is built into the skid distance formula, so no unit conversions are needed.

Plzzz answer both questions and i will give you 100 points