Question

10x-2y=18 8x=y solve by substitution

Answer 1

Answer:

x = -1 and y = 18

Step-by-step explanation:

Given the system of equations

y + 8x = 10... 1

2y - 4x = 40 ... 2

From 1; y = 10-8x

Substitute into 2;

2(10-8x) - 4x = 40

20 - 16x - 4x = 40

20 - 20x = 40

-20x = 40 - 20

-20x = 20

x = -1

Recall that y = 10-8x

y = 10 - 8(-1)

y = 10 + 8

y = 18

therefore your answer is  x = -1 and y = 18

Answer 2

$\large\huge\green{\sf{Answer:-}}$

10x-2y=18 _______(i)

8x=y________(ii)

put value of y in first equation

=> 10x-2(8x)=18

=>10x-16x= 18

=> -6x= 18

=> x= -3

now to find y put in second equation

8x-y

=> 8(-3)= y

=> y= -24