Question

Solve using substitution:
4x − y − 4 = 0
7y = 29 + 9x
Answer Infinitely many solutions
No solution
(3, 8)
(5, 16)

Answer 1

Hint:

y = 4x - 4

Answer 2

thanks so what abt Solve using substitution:
-x + 2y = -7
10y − 5x = 21
Answer Infinitely many solutions
No solution
(-1, -4)
(8, 1/2)

Answer 3

i dnt kn how to do it

Answer 4

So substitution is when you solve one of the equations for a variable and put it into the other equation

Answer 5

ok i gt da part

Answer 6

For this one you could solve -x + 2y = -7 for x. You would add x to both sides and the 7 to both sides to get 2y +7 = x

Answer 7

ok

Answer 8

then put x= 2y + 7 into 10y - 5x = 21. that would look like 10y - 5(2y +7) = 21

Answer 9

ok

Answer 10

Then simplify.
10y - 5(2y + 7) = 21
10y - 10y - 35 = 21
-35 = 21 NOT TRUE
This means there are no solutions. And if you graph then on a calculator you will see the lines are parallel

Answer 11

ok

Answer 12

did that make more sense?

Answer 13

yeah

Answer 14

good:)