Higher November 2024 Paper 2 Q10
10 Use algebra to solve the simultaneous equations
\(4x - 5y = 20\)
\(6x + 7y = -57\)
You must show all your working. (4)
| Answer | Mark | Mark scheme |
|---|---|---|
| \(x = -2.5\), \(y = -6\) | M1 | for a correct method to eliminate one variable (condone one arithmetic error) |
| A1 | for either \(x = -2.5\) or \(y = -6\) oe | |
| M1 | (dep M1) for substituting found value into one of the equations or correct method after starting again (condone one arithmetic error) | |
| A1 | for either \(x = -2.5\) and \(y = -6\) oe SCB2 for both correct answers if no more than 1 mark awarded SCB1 for one correct answer if no marks awarded |
Additional guidance
Fractions do not need to be in simplest form