Question

Which shows three ordered pairs that are all solutions of the equation y = x + 4?

A.
(1, 4), (2, 6), and (3, 7)

B.
(1, 4), (2, 8), and (3, 12)

C.
(3, 7), (5, 9), and (7, 10)

D.
(3, 7), (5, 9), and (7, 11)

Answer 1

@welshfella

Answer 2

take each option in turn and substitute the values of x and y into the equation to see which ones fit.

for example A (1,4):- x = 1 and y = 4:-
4 = 1 + 4
4 = 5
its not this one so you go on to B and try the ordered pairs in B

as with A if the first 1 does n't fit theres no need to try the others

Answer 3

in fact , (1,4) is in B so you can do on to C

Answer 4

@welshfella How does 4 = 5?.

Answer 5

it doesn't of course - so that means (1,4) cannot be a solution to the equation y = x + 4

Answer 6

it (1,4) was a solution we'd have the same number like 5=5

Answer 7

Oh okay. so a and b is done o time for c and d.?.

Answer 8

- I mean the same number would be either side of the '='

Answer 9

right its either c or d

Answer 10

try (3 ,7) x =3 y=7

7 = 3 + 4
7 = 7
so (3,7) is a solution

Answer 11

now you need to try (5,9)

Answer 12

9 = 4 + 5
9=9

Answer 13

@welshfella

Answer 14

- yes that means that (5,9) satisfies the equation
(5,9) is a solution

Answer 15

now see if (7,10























0 is a solution

Answer 16

(7,10) - that is y=10 and x=7

Answer 17

(5,9) 5 X=5,Y=9

9 = 4 + 5

9 = 9

So its a solution?.

Answer 18

(7,10)

10 = 3 + 7

10 = 10

So it is a sulution @welshfella @pooja195 @Godlovesme @BlossomCake

Answer 19

yes

Answer 20

So its C?..@welshfella

Answer 21

@welshfella

Answer 22

does (7,10) fit the equation ?
try it

Answer 23

you have to try all 3 ordered pairs

Answer 24

10 = 3 + 7

Answer 25

no the equation is y = x + 4
so you need to put y = 10 and x = 7 into this equation