It is: 3x+4y which is an algebraic expression
y = 3x 3x + 4y = 30 3x + 4(3x) = 30 3x + 12x = 30 15x = 30 x = 2 y = 3x y = 3(2) y = 6 (2, 6)
1
If you mean: 3x+4y = 12 then y = -3/4x+3 whereas -3/4 or -0.75 is the slope and 3 is the y intercept
7(3y-2)-(-4y+9)
3x + 4y = 12 Subtract 3x from each side 4y = 12 - 3x Divide by 4 on each side y = 3 - .75x The slope is what is multiplied by "x" or -.75
x = 4 and y = 0
(2, -1)
2x + 3y = 17 3x + 4y = 24 (2x + 3x) + (3y + 4y) = (17 + 24) 5x + 7y = 41
4y= -3x + 12 y = -3/4x + 3 The perpendicular slope is 4/3
q2
3x-4x=12 that means -x equals 12 so x equals -12
4y = 3x+11 or as y = 3/4x+11/4
Add the two equations and get 4x = 12 so x = 3 and y = -1
(-1, 5)
(-1, 5)
(1, 1)