Write the equation of the line with the given slope and y-intercept ..slope is -2 and a y-intercept of 5

Slope-intercept form:  y = mx + b

(m is the slope, b is the y-intercept or the y value when x = 0 --> (0, y) or the point where the line crosses through the y-axis)

Since you know:

m = -2

b = 5            Substitute/plug it into the equation

y = mx + b

y = -2x + 5

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.