CAIE IGCSE Mathematics Core C3.5 Equations of Linear Graphs Topic Practice

y=3x+9 cao final answer

B2 for 3x+c or for a correct unsimplified answer
or M1 for a correct rise/run or for a right-angled triangle with run =1 and rise =3 marked on graph oe
or B1 for mx+9 where m is their gradient

$y=\frac{1}{4}x+2$

B2 for $\frac{1}{4}x+c$ or for a correct unsimplified answer
or M1 for a correct rise/run
or for a right-angled triangle with run =a and rise =b labelled with numerical values where $\frac{b}{a}=\frac{1}{4}$ oe
or B1 for mx+2 where m is their gradient

3 x+5

B2 for 3 x+c or (2.7 to 3.3) x+(4.8 to 5.2) or for a correct unsimplified answer

or M1 for a correct rise/run

or for a right-angled triangle with run =a and rise =b marked on graph oe where $b \div a=2.7$ to 3.3

or B1 for m x+5 or m x+ (4.8 to 5.2) where m is their gradient