Solution of equation 3x-5y= 4 4x+3y=15

Answer this question, only if you know the answer. 30 points and brainliest!

Is each relation a function? if so, state whether it is one-to-one or many-to-one. 3. (-4,7), (-3,5), (1,4), (3,-8), (5,-11) 4. (-4,8), (-2,4), (0,1), (2,4), (4,8) 5. (-2, 1), (-2,3), (0,-3), (1,4), (3,1)

Yvaries inversely as x. y =12 when x=5. find y when x=4