Subtract 21ax + 15by - 6cz from 12ax + 6by + 11cz
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When solving equations, number will get operated with another number and variable (the unknown quantity) will get operated with another variable. Always!!
When opening the 2nd bracket, the signs change [eg; - ( + 15by) would became -15by cause -+ = - )
When doing the final step, it’s ideal to keep it all together to avoid any confusion.
Hope this help!
When opening the 2nd bracket, the signs change [eg; - ( + 15by) would became -15by cause -+ = - )
When doing the final step, it’s ideal to keep it all together to avoid any confusion.
Hope this help!
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