Solve 3(x-2)=21
This question can be solved in two ways. One way is to divide the whole equation, both sides by 3, which gives x-2=7. Then add 2 to both sides to give x=9. Another way is to work out the left hand side of the equation first, which gives 3x-6=21. Then add 6 to both sides to give 3x=27. x can then be worked out by 27/3=9.
XY
Related Maths GCSE answers
All answers ▸There are 11 pens in a box, 8 are black, 3 are red. Two pens are taken out at random without replacement. What is the probability the pens are the same colour?
Draw the graph of y=2-3x for values of x from -3 to 3.
A right-angled triangle has a base of 5 cm, a height of 12 cm. Find the length of the hypotenuse.
It is given that sin(x) = 1/2. Find the value of sec(x)