Hello Aspirant,

Hope you are doing well

No, linear equalities chapter will not come in JEE Mains. Important topics that come in JEE Mains are:-

• Coordinate Geometry
• Limits, Continuity and Differentiability
• Integral Calculus
• Complex numbers and Quadratic Equation
• Matrices and Determinants
• Statistics and Probability
• Three Dimensional Geometry
• Vector Algebra
• Sets, Relation and Function
• Permutations and Combinations
• Binomial Theorem and Its Application
• Sequences and Series
• Trigonometry
• Mathematical Reasoning
• Differential Equation
• Statics and Dynamics
• Differential Calculus

For more information, I'm providing you a link:-

https://engineering.careers360.com/articles/jee-main-syllabus-weightage

I hope this information will help you.

Feel free to ask any query.

All the best