Solve the system 4x-5y=3 and 3x-4y=4?

Answer 1

- 12x + 15y = - 9
12x - 16y = 16-----ADD
- y = 7
y = - 7

3x + 28 = 4
3x = - 24
x = - 8

x = - 8 , y = - 7

Answer 2

i could desire to double each and each and each and each component to -3x-5y=15, making the y ingredient have a coefficient of -10...that way, the two y aspects have a coefficient whose absolute fee is 10...then subtract, removing the y. contained interior the 2nd, double the 1st equation, and subtract. contained interior the 0.33, multiply the 1st by using using 3 and the 2nd by using using 2. Subtract.

Answer 3

-5y = -4x + 3
y = 4/5x - 3/5
Change to decimals (easier to work with)
y = .8x - .6


3x - 4(0.8x - 0.6) = 4
3x - 3.2x + 2.4 = 4
-0.2x = 1.6
x = -8

y = .8(-8) - .6
y = -6.4 - .6
y = -7

Check:

4(-8) - 5(-7) = 3 and 3(-8) - 4(-7) = 4
-32 + 35 = 3 and -24 + 28 = 4
3 = 3 and 4 = 4

Hope this helps.