Answer:
x = 16, y = 5
Step-by-step explanation:
Let's eliminate a variable first. In this case, I multiplied the first equation by -2 so that I could get rid of x and solve for y. This is how it looks like:
-2x - 2y = -42
2x + 3y = 47
Combine both these equations and you get y = 5, so you solved for y already!
Now you have to solve for x. Let's use your first equation to do that.
x + y = 21
x + 5 = 21
x = 16
Hope this helps!
