Ihave to do systems by substitution practice
ex -2x + y =-16
-8x - 7y = -20

-2x+y=-16

-8x-7y=-20

Solve -2x+y=-16 for y

Add 2x  to both sides

-2x+y+2x=-16+2x

y=2x-16

Substitute 2x-16 for y in -8x-7y=-20

-8x-7y=-20

Simplify both sides of the equation

-8x-7(2x-16)=-20

Add -112 to both sides

-22x+112+-112=-20+-112

-22x=-132

Divide both sides by -22

-22x/-22=-132/-22

x=6

Substitute 6 for x in y=2x-16

y=2x-16

y=(2)(6)-16

Simplify both sides of the equation

y=-4

Answer :

y=-4 and x=6

I hope that's help !

-22x+112+

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

the answer would be 484

step-by-step explanation:

just multiply 0.484 times 1,000 (formula)