Question 7

Linear equation in one variable has

• (a)only one variable with any power.
• (b)only one term with a variable.
• (c)only one variable with power 1.
• (d)only constant term. If a statement is a proportion, the cross-products of the terms are equal. a c If = , then ad = bc. b d To solve equations like 5t = –20, you still need to get the variable t, on its own. The variable has been multiplied by a number, 5 — so you can get the variable on its own by dividing both sides by that numbers. In this case, you need to divide by 5. 5t = –20 Divide both sides by the same number 5t ÷ 5 = –20 ÷ 5 by which the variable is multiplied. t = –20 ÷ 5 t = –4