Is -3 a solution to the equation #-4x+5=-7#?
2 Answers
Mar 2, 2018
No, but
Explanation:
Substitue -3 into the equation, what do you get?
Do obviously -3 is not a solution.
Find what is the solution:
Rewrite the equation by transposing the terms:
Get rid of the minus signs
So
Mar 2, 2018
Explanation:
#"if x = - 3 is a solution then it will satisfy the equation"#
#"substitute "x=-3" into the equation"#
#(-4xx-3)+5=12+5=17!=-7#
#rArrx=-3 " is not a solution"#
#-4x+5=-7#
#"subtract 5 from both sides"#
#-4xcancel(+5)cancel(-5)=-7-5#
#rArr-4x=-12#
#"divide both sides by "-4#
#(cancel(-4) x)/cancel(-4)=(-12)/(-4)#
#rArrx=3#
#color(blue)"Check "(-4xx3)+5=-12+5=-7" True"#
#rArrx=3" is the solution"#