If you multiply my number by -4 and subtract 20, the result is 8. What’s my number?

If 20% of a number is 35, what is 50% of that number?

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?