15y+31=61 how do I solve this

If a || b and e || f , what if the value of y ?

Solve the system of equations. y=3x-1 and y=-2x+9. show work

Which two properties of equality could zoe use to finish solving for x? the equation is 3x - 4 = -10 for x so a either the addition or subtraction property of equalityb ether the multiplication or division property of equality c ether the addition or division property of equality d ether the subtraction or division property of equality just a simple a b c or d plz.