How do I solve this system of equations by adding, subtracting, or multiplying?
x-y=8;x+y=12

Find the equation of a line that is perpendicular to line g that contains (p, q). coordinate plane with line g that passes through the points negative 3 comma 6 and 0 comma 5 3x − y = 3p − q 3x + y = q − 3p x − y = p − q x + y = q − p

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Which of the following statements are true about the graph of f (x) = 1/4 coz ( x + π/3) - 1? select two of the following that apply.