How do you find the value of x and y for
4x+5y=102
7x+5y=126

Question

How do you find the value of x and y for 
4x+5y=102
7x+5y=126

anonymous · Answer

Elimination, substitution, matrix, graph? which method?

anonymous · Answer

Solve the first equation for y, then plug that into the second equation to solve for x. Once you know x you can plug that into the first equation to find y.

anonymous · Answer

i was thinking substitutio imranmeah

anonymous · Answer

but how do i solve for y?

anonymous · Answer

4x+5y=102
7x+5y=126

We will solve by elimination

anonymous · Answer

We want y to cancel to we multiply one equation by -1
4x+5y=102
-7x-5y=-126
----------------
-3x=-24
x=8

anonymous · Answer

Now plug that x value back in to find y value
4(8)+5y=102
32+5y=102
5y=102-32
5y=72
y=14.4

anonymous · Answer

alright!

anonymous · Answer

that really helps!

anonymous · Answer

how does that cancelling work?

anonymous · Answer

5y and -5y cancel when you add them

anonymous · Answer

If I helped you may award me a medal or become my fan. Click Good Answer to give me a medal.

anonymous · Answer

where is good answer?

anonymous · Answer

Thank you

anonymous · Answer

i figured it out XD i had to refresh