Solve for b. r = x(a + b) a) b = (r - a)/x b) b = (a - rx)/x c) b = (r - ax)/x

R = x(A+B)

distribute

R=Ax+Bx

subtract Ax from each side

R-Ax=Bx

divideby x

(R-Ax)/x =B

Choice C

dilation scale factor 2: starting with δabc, draw the dilation image of the triangle with a center at the origin and a scale factor of two. notice that every coordinate of the original triangle has been multiplied by the scale factor (x2). dilation with scale factor 2, multiply by 2.