If the mass of the earth is approximately 5.9x10^24 kg and the mass of the sun is approximately 1.9x10^30 kg, how many earths would it take to equal the mass of the sun?

The slope-intercept form is expressed as y = mx + b where m is the slope of the line and b is the y-intercept. To be able to write the given information, into this form, we use the point slope form. We do as follows:

y − y1 = m(x − x1) 
y − 7 = -2(x − 6)
y - 7 = -2x + 6
y = -2x +13