SOLUTION: On my homework it says:
Solve the system of equations through elimination.
2x-3y=21
-6x+2y=7
I have tried so many times but can't figure it out. And how do I know whether to
Algebra.Com
Question 1007851: On my homework it says:
Solve the system of equations through elimination.
2x-3y=21
-6x+2y=7
I have tried so many times but can't figure it out. And how do I know whether to add or subtract?
I'd greatly appreciate it if I could be taught HOW to solve this, not just the answer.
Thank You!
Found 2 solutions by tiffany222, MathLover1:
Answer by tiffany222(56) (Show Source): You can put this solution on YOUR website!
2x - 3y = 21
-6x + 2y = 7
Step 1: Eliminate either x or y to solve for one value. In this problem, we will eliminate x by multiplying the first equation by 3.
6x - 9y = 63
-6x + 2y = 7
Step 2: Add the two equations to eliminate x and solve for y. We add because we want the x coefficient to become 0.
-7y = 70
y = -10
Step 3: Substitute the y value we just got into either one of the two original equations to get the x value. I decided to use the first equation, but using the second equation will also get you the right answer.
2x - 3y = 21
2x - 3(-10) = 21
2x + 30 = 21
2x = -9
x = -4.5
Final Answer:
x = -4.5
y = -10
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
Solve the system of equations through elimination.
.....eq.1.........both sides multiply by
.........eq.2
-----------------------------
.....eq.1
.........eq.2
-----------------------------add both eq.1 and eq.2
.......eliminate and
now go back to .........eq.2, substitute for and find
or
so, these two lines intersect at point (,)
RELATED QUESTIONS
Hello. Ok the problem that I am having with my homework is this. The question says to... (answered by checkley71)
okay so iam doing my algebra homework. and in school i get it perfect-ally fine but than... (answered by Alan3354)
Hello I am trying to do my math homework and there are still questions that I just don't... (answered by Alan3354)
I am working on systems of linear equations, which I have until now been able to complete (answered by funmath)
solve the system of equations by graphing:
2x+y=7
x+3y=6
When I tried solving... (answered by mananth)
Question #21 is Use the substitution method to solve the linear system. These are the... (answered by stanbon,chitra)
1.) I have tried many times and the answers are wrong. Please help me solve this:
Solve... (answered by richwmiller)
What is the x and y value of this system of equations?
-4x-2y equals -12
4x+8y equals... (answered by Alan3354)
Hello, I need help with my summer assignment. It's a two-part question. The first part... (answered by josgarithmetic,ikleyn)