Solve the system of equation 3x - 4y + 1 = 0 and 9x - 7y = 15
using elimination.

Step-by-step explanation:

First rearrange all equations into this format:

that will result in:

then we'll multiply an equation with a number such that we have same numbers on both equations (with only different signs). So we can add them

Here you can see that we've multiplied the first equation with (-3) so that we have -9x on one equation and 9x on the other. Now when we add the two equations the 9x and -9x terms will cancel out (or eliminate)

now that we've found the value of y

we'll use this value in any of the two equations to get the value of x.

let's put y in the first equation:

cut 138 centimeters off

step-by-step explanation:

250-112 = 138