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C. y = 2x - 3 and 3x + 6y = 12

Step-by-step explanation:

The line with a positive gradient passes through (0, -3) and (2, 1)

The gradient of this line = Change in y ÷ change in x

= (1 - - 3) ÷ (2 - 0) = 4/2 = 2

The equation of this line is;

= 2

y = 2x - 3

The line with a negative gradient passes through (0, 2) and (2, 1)

The gradient of this line = Change in y ÷ change in x

=

The equation of this line is;

y = x + 2

y + = 2

Multiplying by 6 throughout gives;

3x + 6y = 12