Question

-8x+y=6 7x-1y=-4 Solve using substitution please

Answer 1

Y = 8x +6

7x - (8x + 6)= -4

7x - 8x - 6 = -4
-x - 6 = -4
-x = 2
x = -2

y = 8(-2) + 6
y= -16 + 6 = -10

Answer 2

-8x + y = 6

in the first equation, isolate y and then it becomes...

y = 6 + 8x

use this to replace the y in the second equation.

7x - 1y = -4

let y = 6 + 8x

7x - (6 + 8x) = -4

7x - 6 - 8x = -4

-x - 6 = -4

x + 6 = 4

x = 4 - 6

x = -2

now use this x = -2 into the equation with y.

y = 6 + 8x

y = 6 + 8(-2)

y = 6 -16

y = -10

Therefore, x = -2 and y = -10



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