Question

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

Answer 1

Elimination, substitution, matrix, graph? which method?

Answer 2

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.

Answer 3

i was thinking substitutio imranmeah

Answer 4

but how do i solve for y?

Answer 5

4x+5y=102
7x+5y=126

We will solve by elimination

Answer 6

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

Answer 7

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

Answer 8

alright!

Answer 9

that really helps!

Answer 10

how does that cancelling work?

Answer 11

5y and -5y cancel when you add them

Answer 12

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

Answer 13

where is good answer?

Answer 14

Thank you

Answer 15

i figured it out XD i had to refresh