Solve the simultaneous equations: 2x + y = 18 and x - y = 6
We need to find a value of x to sub into equation 1, so add y to both sides of equation 2: x = 6 + y. Then sub this into the x value of equation 1 and solve to find y: 2(6 + y) + y = 18. 12 + 2y + y = 18. 3y + 12 = 18. 3y = 6. y = 2. To find the x-value, sub in this value of y into equation 2 and solve: x - (2) = 6. x = 8.
AW
Related Maths GCSE answers
All answers ▸To make 12 cakes you need 100g of butter, 6 eggs, and 40g of sugar. How many cakes can you make with 450g of butter, 15 eggs, and 110g of sugar?
Make s the subject of the equation: 4st + 8 = 5r
8x – 7 > 6x + 12
A ladder of length 6.5m is leaning against a vertical wall. The foot of the ladder is 1.5m from the wall. Calculate the distance the ladder reaches up the wall to 3 significant figures.