How can you tell that 7.630 and 7.63 are equivalent decimals?

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

Combine like terms to make a simpler expression 3z+z

Write the equations in logarithmic form 9^4=6,561