The answer and steps for this question

I will solve your system by substitution.x=3y−1;5x−7y=19Step: Solvex=3y−1for x:Step: Substitute3y−1forxin5x−7y=19:5x−7y=195(3y−1)−7y=198y−5=19(Simplify both sides of the equation)8y−5+5=19+5(Add 5 to both sides)

8y=248y8=248(Divide both sides by 8)y=3Step: Substitute3foryinx=3y−1:x=3y−1x=(3)(3)−1x=8(Simplify both sides of the equation)

x=8 and y=3

What u do is put the top x equation into the bottom equation. So it would be 5•3y-1-7y=19. Next it would be 15y-7y-1=19. After that it would be 8y-1=19
After you would add 1 to both sides
8y=20
Y=2.5

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2