Substitution Literacy Skills Practice Research Memory Stretch F U O M Can you unscramble this set of letters? Describe the word you unscramble! Write out an explanation for what substitution ‘is’. Skills Practice If 𝑎=3, work out these expressions. F U O M L R A 2𝑎 𝑎+4 𝑎+𝑎 𝑎−3 𝑎×𝑎 𝑎÷𝑎 5𝑎 4𝑎+1 If 𝑥=2 and 𝑦=4, work out these expressions. 2𝑥 𝑦+4 𝑥+𝑦 𝑦−𝑥 𝑥×𝑦 𝑦÷𝑥 5𝑥+2𝑦 𝑥+1+𝑦 Research Research and find a formula that you find interesting. Write what you interests you about the formula! The cost of a phone call is 𝐶 pence which is calculated using the formula 𝐶=20+5𝑚, where 𝑚 is the number of minutes the phone call lasted. Find the value of 𝐶 when 𝑚=1 𝑚=5 𝑚=12 The number of cakes bought for a birthday party depends on the number of boys, 𝐵, and the number of girls, 𝐺. If 𝑛=2(3𝐵+2𝐺), find 𝑛 when 𝐵=4, 𝐺=2 𝐵=3, 𝐺=2 𝐵=0, 𝐺=5 Memory Remember substitution involves replacing the representative letter with a number! Stretch The USA measures temperature in °F. Europe uses °C. You can change °F to °C using the formula 𝐶= 5 9 𝐹−32 . Convert 212 °F and 32 °F to °C. What is special about these two temperatures?