{"id":21214,"date":"2026-05-25T22:26:59","date_gmt":"2026-05-25T16:26:59","guid":{"rendered":"https:\/\/mcqacademy.com\/en\/mcq\/evaluate-a-linear-function-6\/"},"modified":"2026-05-25T22:26:59","modified_gmt":"2026-05-25T16:26:59","slug":"evaluate-a-linear-function-6","status":"publish","type":"mcq","link":"https:\/\/mcqacademy.com\/en\/mcq\/evaluate-a-linear-function-6\/","title":{"rendered":"Evaluate a linear function"},"content":{"rendered":"<p>If f(x) = 6x + 9, find f(-1).<\/p>\n<ul class=\"quiz-options\">\n<li>-15<\/li>\n<li>8<\/li>\n<li>-3<\/li>\n<li>3<\/li>\n<li>48<\/li>\n<\/ul>\n","protected":false},"author":39,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","topic":[2897,2717],"subject":[2750],"education_level":[1894],"class_list":["post-21214","mcq","type-mcq","status-publish","hentry","topic-algebraic-substitution","topic-functions","subject-advanced-mathematics","education_level-grade-8"],"mcq_note":"Substitute x = -1 into the function: f(-1) = 6 \u00d7 -1 + 9 = 3. A function gives an output for each input. To evaluate f(x), replace every x in the rule with the given number before simplifying. Be especially careful with negative inputs, because multiplying two negative signs can make a positive result. The correct answer is 3, which matches the calculation or reasoning shown.","mcq_options":[{"right":"no","answer":"-15"},{"right":"no","answer":"8"},{"right":"no","answer":"-3"},{"right":"yes","answer":"3"},{"right":"no","answer":"48"}],"multi_answers":"no","subject_terms":[{"id":2750,"title":"Advanced Mathematics","slug":"advanced-mathematics"}],"topic_terms":[{"id":2897,"title":"Algebraic Substitution","slug":"algebraic-substitution"},{"id":2717,"title":"Functions","slug":"functions"}],"_links":{"self":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq\/21214","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq"}],"about":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/types\/mcq"}],"author":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/users\/39"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/comments?post=21214"}],"wp:attachment":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/media?parent=21214"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/topic?post=21214"},{"taxonomy":"subject","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/subject?post=21214"},{"taxonomy":"education_level","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/education_level?post=21214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}