20. parallel lines will have the same slope, but different y intercepts In y = mx + b form, the slope is in the m position and the y intercept is in the b position. So y = 3x + 4 and y = 3x + 6 are parallel lines
21. perpendicular lines will have negative reciprocal slopes. lets say u have a line..y = 2/3x + 4....the slope here is 2/3. To find the negative reciprocal, flip the slope and change the sign. So we have 2/3, flip the slope making it 3/2, change the sign making it -3/2. So ur perpendicular line will have a slope of -3/2. so ur equations can be : y = 2/3x + 4 and y = -3/2x + 4
22. y = 2x + 5...slope here is 2. Parallel lines have the same slope.
y = mx + b slope(m) = 2 (-3,1)...x = -3 and y = 1 sub and find b, the y int 1 = 2(-3) + b 1 = -6 + b 1 + 6 = b 7 = b so this equation is : y = 2x + 7
23. 4x + 3y = (I cant see the last number..but we dont need it) 3y = -4x + ? y = -4/3x + ?.....slope here is -4/3. A perpendicular line will have a negative reciprocal slope. So out perpendicular line will have a slope of 3/4.
y = mx + b slope(m) = 3/4 (-8,-5)...x = -8 and y = -5 sub and find b, the y int -5 = 3/4(-8) + b -5 = - 6 + b -5 + 6 = b 1 = b so ur equation is : y = 3/4x + 1
She is incorrect cause if we take the number 20 and take 25% of it it equals 5 so now 20 is only 15. They if we take 75% away from 20 is equals 15 so then we only have 5 from 20 left. Therefore she’s incorrect because 75% leaves 5/20 and 25% leaves 15/20. Hope that makes sense.
