Algebra · Matemáticas
Linear functions en el SAT
Linear functions asks you to read or build a function whose graph is a line, and to say what its slope and intercept mean in a situation.
- Sección
- Matemáticas del SAT
- Dominio de contenido
- Algebra
- Peso en la sección
- 35%
- Preguntas que cuentan
- Unas 14 por examen
De las preguntas que cuentan en esa sección
De 40 preguntas que cuentan en la sección
Cómo son las preguntas
A function written as f(x) = mx + b, a table of inputs and outputs, a graph, or a described scenario with a starting value and a steady rate.
El error que cuesta puntos
Reading the slope as a total instead of a rate, and treating the intercept as the starting value when the model begins somewhere else.
Cómo resolverlas
Name what the input and the output measure in words, then state the slope as change in output per one more unit of input. Contextual questions are almost always asking for that sentence.
Practica Linear functions ahora
Diez preguntas sobre esta destreza, sin cronómetro y con la explicación después de cada respuesta. No hace falta cuenta; si inicias sesión, la misma práctica también alimenta la precisión por destreza que lee tu plan de estudio.
Preguntas sobre Linear functions
- How do you find the slope from a table?
- Take the change in output between two rows and divide by the change in input between the same rows. If the ratio is the same for every pair of rows, the table is linear and that ratio is the slope.
- What does f(a) = b mean in these questions?
- It gives you a point: the input a produces the output b, so the graph passes through (a, b). Questions often hand you two of these to fix a line without ever mentioning slope.
- How many Linear functions questions are on the SAT?
- College Board does not publish a count per question type, only per content domain. Algebra makes up about 35 percent of the Math section, which is roughly 14 of the 40 scored Math questions on a full form. Questions on this skill come out of that share.
Más destrezas de Algebra
- Linear equations in one variableOne equation, one unknown.
- Linear equations in two variablesThese questions give you a line in symbols, a table, or words, and ask for a coefficient, an intercept, or a point that satisfies it.
- Linear inequalities in one or two variablesInequalities ask for the range of values that satisfies a condition, or for the part of a graph where the inequality holds.
- Systems of two linear equations in two variablesSystems ask for the pair that satisfies both equations at once, or, more often on the SAT, for how many solutions the pair has.