2{ 5[7 + 4(17 - 9) - 22]}

7x+8y=-18, 4x-9y=-3 solve the system of equations

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

What is the value of x in the equation 3x4y65, when y=4?