# Does It Fit?

In this worksheet, students state whether or not the given solution fits the formula.

Key stage:  KS 3

Curriculum topic:   Algebra

Curriculum subtopic:   Use Standard Mathematical Formulae

Difficulty level:

### QUESTION 1 of 10

Given the formula y = 2x + 3, we can test to see whether the solution  (4,10) works.

Remember that in (4,10), the first number is the x number so this means that

x = 4 and  y = 10

We substitute x = 4 into the formula to see whether it gives y = 10.

y = 2x + 3

y = 2 times x + 3

y = 2 x 4 + 3

y = 8 + 3

y = 11

So x = 4, y = 10 does not fit.

Does the solution given below fit the formula? ....   y = 3x - 2

(2, 8)

No

Yes

Does the solution given below fit the formula? ....   y = 3x - 2

(7, 19)

No

Yes

Does the solution given below fit the formula? ....   y = 5x - 7

(3, 2)

No

Yes

Does the solution given below fit the formula? ....   y = 5x - 7

(3, 9)

No

Yes

Does the solution given below fit the formula? ....   y = 5x - 7

(13, 4)

No

Yes

Does the solution given below fit the formula? ....   y = 5x - 7

(1, -2)

No

Yes

Does the solution given below fit the formula? ....   y = 6x + 5

(0, 5)

No

Yes

Does the solution given below fit the formula? ....   y = 6x + 5

(9, 59)

No

Yes

Does the solution given below fit the formula? ....   y = 6x + 5

(11, 69)

No

Yes

Does the solution given below fit the formula? ....   y = 6x - 5

(12, 67)

No

Yes

• Question 1

Does the solution given below fit the formula? ....   y = 3x - 2

(2, 8)

No
• Question 2

Does the solution given below fit the formula? ....   y = 3x - 2

(7, 19)

Yes
• Question 3

Does the solution given below fit the formula? ....   y = 5x - 7

(3, 2)

No
• Question 4

Does the solution given below fit the formula? ....   y = 5x - 7

(3, 9)

No
• Question 5

Does the solution given below fit the formula? ....   y = 5x - 7

(13, 4)

No
• Question 6

Does the solution given below fit the formula? ....   y = 5x - 7

(1, -2)

Yes
• Question 7

Does the solution given below fit the formula? ....   y = 6x + 5

(0, 5)

Yes
• Question 8

Does the solution given below fit the formula? ....   y = 6x + 5

(9, 59)

Yes
• Question 9

Does the solution given below fit the formula? ....   y = 6x + 5

(11, 69)

No
• Question 10

Does the solution given below fit the formula? ....   y = 6x - 5

(12, 67)

Yes
---- OR ----

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