WILL GIVE YOU BRAINLIEST ruby bought $18 worth of donuts and cookies. each donut costs $1 and each cookie costs $1.50. she bought a total of 15 donuts and cookies all together. graphically solve a system of equations in order to determine the number of donuts, x, and the the number of cookies, y, that ruby bought.

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!