If the lines represented by two equations in the following groups are parallel, what value should a take? (1) 2x + 3Y = a4x + 6y-3 = 0

If the lines represented by two equations in the following groups are parallel, what value should a take? (1) 2x + 3Y = a4x + 6y-3 = 0

1 formula * 2, a = 3 / 2 can be obtained

If two equations in the following groups indicate that the lines are parallel, what value should a take? 1. X + 2ay-1 = 0 (3a-1) x-ay-1 = 0 2.2x + 3Y = a 4x + 6y-3 = 0

1、2a/1=(-a)/(3a-1)
A = 0 or a = 1 / 6
2、2a≠3
a≠3/2

Find the equation of the median parallel line of l1:2x + 3y-1 = 0, l2:4x + 6y-5 = 0

It's a good slope, isn't it? Then find the middle point of the intersection with the y-axis. Everything's OK

By using the method of addition, subtraction and elimination, the following two equations are obtained: X ratio y = 2 ratio 3 4x + 6y = 52 x + 1 / 2 = y + 2 / 3 2x-3y = 4
X vs y = 2 vs 3 4x + 6y = 52
X+1/2=y+2/3 2x-3y=4

1、x∶y=2∶3①
4x+6y=52②
3x-2y=0③
③ X 3
9x-6y=0④
② + 4, get
13x=52
x=4
When we substitute x = 4 into 2, we get the following result
y=6
2、x+1/2=y+2/3①
2x-3y=4②
① 6, and the term was shifted
6x-y=1③
③ X 3
18x-3y=3④
④ - 2, get
16x=2
x=1/8
Substituting x = 1 / 8 into 2, we get
y=5/4