Question

solve by substitution?
y=1
-4x-9y=7
find coordinates

Answer 1

Answer: x=-4

Step-by-step explanation:

-4x - 9y = 7

-4x - 9(1) = 7 [since y=1 is given]

-4x -9 = 7

-4x = 7+9

-4x = 16

x=16/-4

x = -4

Answer 2

given

y=1

as per sum

-4x-9 (1)=7

-4x=7+9=16

x=16/-4=-4