PLEASE HELP ME I WILL BE CHOOSING BRAINLIEST (please answer all 3 if you can)

3x + 4y = 5 x- 3y = -7 solve by substitution

Which must be true in order for the relationship △zyv ~ △xwv to be correct? zy ∥ wx ∠z ≅ ∠y and ∠w ≅ ∠x zv ≅ vy and wv ≅ vx ∠z ≅ ∠x and ∠w ≅ ∠y

Solve the system of equations using the linear combination method. {4x−3y=127x−3y=3 enter your answers in the boxes.