Yo i need help please no links i just need the correct answer to pass this

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

What properties allow transformation to be used as a problem solving tool