Which expression is equivalent to 4a?

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

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