7th grade math check
posted by saranghae12 .
Ok I was wondering if you could check these 3 problems please. I am suppose to set these equations equal but I am not sure if did them right. I think I accidently solved these systems as substitutions. The answers are suppose to be in coordinate pairs.
1) x  y = 11
3x + y = 21
I got (5,16)
2) 5x  4y = 17
10x + 4y = 42
I got (5,3)
3) x + 3y = 1
3x + 3y = 15
I got (4,1)
Please check if i did it correctly please. thank you

7th grade math check 
MathGuru
Check your solutions with both equations. If your solutions don't fit both, then your answers need to be reworked. For example, using the solution you have for 1):
x = 5
y = 16
5  (16) = 11 >false
3(5)  16 = 21 >false
Solution for this system should be (5,6).
5  (6) = 11 >true
3(5)  6 = 21 >true
Try the others again.
Respond to this Question
Similar Questions

third grade math
how do you check addition problems by adding up? 
Math (Check)
The equation y = a^x is a decreasing function a = 1) 1 2) 2 3) 3 4) .25 I think that the correct answer is 3) 3...but I am not sure why? 
grade 9 math slope equations
question: slove by comparison and check your solution? 
PreCalculus
Find the values of x for which the line y=2x intersects the parabola y=(x1)^2+1. So I set the equations equal to eachother, and solved for x using the quadratic formula. The solution I got was: x=3.41 and x=0.59. Could someone please … 
MAT 7th GRADE
Please help. Will someone please check the answer to these problems. Thank you 1. 14 x3 = 42 2. 24 15 = 39 3. 48 divided by 12 = 4 4. 150 divied by 30 = 5 5. 3/4 + 5/12 = 1 1/6 6. 14 1/2 + 3 7/8 = 18 5/8 
MATH 7th GRADE
Would someone please be kind enough to check the answers for these problems? 
7th grade Math
can someone please check this for me. Be sure to round to the nearest hundred. 1) 6 eggs in 7 days 2) 8 batteries in 3 months 3) 122 patients in 4 weeks 4) $8.43 for 3 pounds 
Math
CAN SOMEONE CHECK MY ANSWERS PLEASE? What types of problems can be solved using the greatest common factor? 
MathPLEASE check my answers
What types of problems can be solved using the greatest common factor? 
7th grade math
Can you check these problems? 1. 4x^2 + 3x  4x +5 = 4x^2  x + 5 2. m  n + m  n  n = 2m  3n 3. (7x + 5  3y)  (3x  5 +4y) = 7x + 3x 3y + 4y + 0 = 10x  y = 0 4. m/8  9 = 5 m/8 = 5 + 9 m = 14/8 m = 7/4 = 1 3/4