alleryStart learning →Solve the equation 100 equals y plus 74.
Ay=174
By=100
Cy=24
Dy=26
Answer & Solution
Correct answer: D. y=26
1. To isolate y, subtract 74 from both sides, no matter which side the variable is on.
2. 100 minus 74 equals y plus 74 minus 74.
3. Simplify: 26 equals y.
4. Adding 74 instead of subtracting it would give 174, which undoes the wrong operation.
_Source: OpenStax Prealgebra (CC BY 4.0), Ch 2 "The Language of Algebra", section 2.3 Solving Equations Using the Subtraction and Addition Properties of Equality_
Keep practising The Language of Algebra
Browse all The Language of Algebra questions for Key Stage 3 (KS3), or explore more Mathematics topics.
Related questions
Complete the number line rulePick the number line fact, fastThe number 1 has only one factor, itself. Where does 1 fit among prime and composite numbeA prime number is a counting number greater than 1 with what property regarding its factorIf two counting numbers a and b multiply to give m, what are a and b called?Is 645 divisible by 3, using the divisibility test based on the sum of its digits?Using the divisibility test for 2, which digit in the ones place tells you a number is divA number is a multiple of n when it fits which description?