3x+7y=9,4x-7y=5

3x+7y=9,4x-7y=5

x=2,y=3/7

If the equation 2x + 3Y = 4 is transformed and Y is expressed by an algebraic expression containing x, then y=______ ．

By changing the term, 3Y = - 2x + 4, the coefficient of Y is 1, y = − 2x + 43. So the answer is y = − 2x + 43

Given that z is not equal to 0, x, y, Z satisfy 4x-7y-5x = 0, 2x-y-z = 0

In 4x-7y-5x = 0, 5x is 5Z
4x-7y-5Z=0 （1）
2x-y-z=0 （2）
If you want to find X: y, you need to find a way to get rid of Z, 2x-y-z = 0. Both sides of this formula are X5, 10x-5y-5z = 0 (3)
With (3) - (1), it becomes 3x + y = 0, X: y = - 1:3, right

Pass through points a (6,0), B (1,5), and the center of the circle is on the straight line 2x-7y + 8 = 0
What can we know from a linear equation AX + by + D = 0

The straight line passing through the midpoint of AB and perpendicular to ab passes through the center of the circle, so the slope of the midpoint of AB (7 / 2,5 / 2) is - 1, so the linear equation is Y-5 / 2 = (X-7 / 2), that is, x-y-1 = 0, and 2x-7y + 8 = 0 to get the center of the circle (3,2), radius square = 13
The equation of circle is: (x-3) ^ 2 + (Y-3) ^ 2 = 13

These are musicians who sing their own songs

1. Same as upstairs
2.These are the musicians who sing songs writen by themselves.^-^

Because they sing very well

because they sing very well.

English translation
The dentist ____ _____ she should come another day.
What are you filling in,

suggest that
advise that
propose that

English translation
Such as the title

make an appointment with the dentist

He can't be a dentist

He can't be a dentist.
I wish you progress in your study and your English is getting better and better~

When I grow up, I want to be a musician

i want to be a musician when i grow up